Remove Javadoc from repo, get it from Maven (#388)

Removes generated files from the repo and makes #385 easier to review by reducing the number of changed files.

Author: zbynek

pom.xml

@@ -12,8 +12,8 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.target>1.7</maven.compiler.target>
-    <maven.compiler.source>1.7</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+    <maven.compiler.source>1.8</maven.compiler.source>
   </properties>
 
   <build>
@@ -87,7 +87,29 @@
           </execution>
         </executions>
       </plugin>
-
+      <plugin>
+        <artifactId>maven-dependency-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>unpack</id>
+            <phase>prepare-package</phase>
+            <goals>
+              <goal>unpack</goal>
+            </goals>
+            <configuration>
+              <artifactItems>
+                <artifactItem>
+                  <groupId>org.gwtproject</groupId>
+                  <artifactId>gwt-dev</artifactId>
+                  <version>2.12.1</version>
+                  <classifier>javadoc</classifier>
+                </artifactItem>
+              </artifactItems>
+              <outputDirectory>${project.build.directory}/generated-site/javadoc/latest</outputDirectory>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <artifactId>maven-assembly-plugin</artifactId>
         <executions>

src/main/markdown/doc/latest/DevGuideCodingBasicsJSON.md

@@ -30,7 +30,7 @@ See [json.org/example.html](http://www.json.org/example.html) for more JSON exam
 
 ## Parsing JSON<a id="parsing"></a>
 
-You can parse JSON Strings and convert them to a [JavaScriptObject](/javadoc/latest/com/google/gwt/core/client/JavaScriptObject.html) using [JsonUtils](https://www.gwtproject.org/javadoc/latest/com/google/gwt/core/client/JsonUtils.html).
+You can parse JSON Strings and convert them to a [JavaScriptObject](/javadoc/latest/com/google/gwt/core/client/JavaScriptObject.html) using [JsonUtils](/javadoc/latest/com/google/gwt/core/client/JsonUtils.html).
 
 ```java
 /*

src/main/markdown/doc/latest/DevGuideCodingBasicsJsInterop.md

@@ -1,7 +1,7 @@
 JsInterop
 ===
 
-JsInterop is one of the core features of GWT 2.8. As the name suggests, JsInterop is a way of interoperating Java with JavaScript. It offers a better way of communication between the two using annotations instead of having to write JavaScript in your classes (using JSNI). More details about the annotations can be found in GWT javadoc: https://www.gwtproject.org/javadoc/latest/jsinterop/annotations/package-summary.html
+JsInterop is one of the core features of GWT 2.8. As the name suggests, JsInterop is a way of interoperating Java with JavaScript. It offers a better way of communication between the two using annotations instead of having to write JavaScript in your classes (using JSNI). More details about the annotations can be found in [GWT javadoc](/javadoc/latest/jsinterop/annotations/package-summary.html)
 
 
 ## Exporting a Java type to JavaScript

src/main/markdown/doc/latest/DevGuideLinkers.md

@@ -3,12 +3,12 @@
 The Linker subsystem takes care of writing the GWT compiler's output. It's responsible for each output file's name, location, and content.
 
 Inside the compiler, each output file is represented by an
-[Artifact](https://www.gwtproject.org/javadoc/latest/com/google/gwt/core/ext/linker/Artifact.html).
+[Artifact](/javadoc/latest/com/google/gwt/core/ext/linker/Artifact.html).
 
 You usually do not need to care about them, unless you have specific requirements.
 
 Linkers create several kinds of files (see
-[EmittedArtifact.Visibility](https://www.gwtproject.org/javadoc/latest/com/google/gwt/core/ext/linker/EmittedArtifact.Visibility.html)):
+[EmittedArtifact.Visibility](/javadoc/latest/com/google/gwt/core/ext/linker/EmittedArtifact.Visibility.html)):
 
 - **Public files** are those intended to be downloaded by web browsers.
 This includes JavaScript and other resource files.
@@ -64,7 +64,7 @@ In case you have specific needs not covered by the existing linkers, you can cre
 
 First, implement your linker. It must be a class extending the [Linker](/javadoc/latest/com/google/gwt/core/ext/Linker.html)
 abstract class (check its documentation), or
-[AbstractLinker](https://www.gwtproject.org/javadoc/latest/com/google/gwt/core/ext/linker/AbstractLinker.html).
+[AbstractLinker](/javadoc/latest/com/google/gwt/core/ext/linker/AbstractLinker.html).
 
 Using the `@LinkerOrder` annotation, you can specify whether it is a pre-, post- or primary linker.
 You must also annotate it with the `@Shardable` annotation.

src/main/resources/main.tpl

@@ -47,7 +47,7 @@
                     <li><a href="makinggwtbetter.html"><i class="icon_makeGWTBetter"></i>Make GWT Better</a></li>
                     <li class="sep"><a href="terms.html"><i class="icon_terms"></i>Terms</a></li>
                     <li class="btn"><a href="download.html"><i class="icon_download"></i>Download</a></li>
-                    <li class="btn"><a href="https://www.gwtproject.org/javadoc/latest/"><i class="icon_jd"></i>Java Doc</a></li>
+                    <li class="btn"><a href="javadoc/latest/"><i class="icon_jd"></i>Java Doc</a></li>
                 </ul>
                 <div id="social">
                     <a href="https://gitter.im/gwtproject/gwt" target="_blank" title="Access our Gitter community">