Bumping google-http-client version (#171)

* Bumping google-http-client version

* Bumping checkstyle to fix mac build

Author: garrettjonesgoogle

pom.xml

@@ -45,7 +45,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <java.version>1.6</java.version>
-    <project.google.http.version>1.23.0</project.google.http.version>
+    <project.google.http.version>1.24.1</project.google.http.version>
     <project.junit.version>4.12</project.junit.version>
     <project.guava.version>20.0</project.guava.version>
     <project.appengine.version>1.9.64</project.appengine.version>
@@ -184,14 +184,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-checkstyle-plugin</artifactId>
-        <version>2.17</version>
-        <dependencies>
-          <dependency>
-            <groupId>com.puppycrawl.tools</groupId>
-            <artifactId>checkstyle</artifactId>
-            <version>6.15</version>
-          </dependency>
-        </dependencies>
+        <version>3.0.0</version>
         <executions>
           <execution>
             <id>checkstyle</id>