Travis CI build. (#83)

* Added Travis CI build.

* Travis CI fix.

* Added environment check.

* JDK set to OracleJDK 8.

* Skip installation step in Travis CI.

* Travis CI script cleanup.

* Target updated to verify, added Travis caching.

* Added build status into readme.

* Update README.md

Fixed README

Author: Tomas-Kraus

.travis.yml

@@ -0,0 +1,15 @@
+language: java
+
+jdk:
+  - oraclejdk8
+  - oraclejdk9
+
+cache:
+  directories:
+    - .autoconf
+    - $HOME/.m2
+
+install: true
+
+script:
+  - mvn -U -C -Dnon.final=true clean verify

README.md

@@ -1,3 +1,5 @@
+[![Build Status](https://travis-ci.org/eclipse-ee4j/jsonp.svg?branch=master)](https://travis-ci.org/eclipse-ee4j/jsonp)
+
 # JSON Processing (JSON-P)
 
 This projects contains API and Reference Implementation (RI) of JSR-374. 
@@ -18,4 +20,4 @@ mvn -U -C clean install -Dnon.final=true
 ## Links
 
 - JSON-P official web site: https://javaee.github.io/jsonp
-- JSR-374 page on JCP site: https://jcp.org/en/jsr/detail?id=374
+- JSR-374 page on JCP site: https://jcp.org/en/jsr/detail?id=374