Updated Travis CI build  o removed openjdk6 as not supported out-of-the-box on Travis Trusty image  o changed oraclejdk7 to openjdk7 to solve issue with JAVA_HOME not set on Travis Trusty image  o now builds with Maven 3.0.5, 3.3.9, and 3.5.2
Updated Travis CI build
 o removed openjdk6 as not supported out-of-the-box on Travis Trusty image
 o changed oraclejdk7 to openjdk7 to solve issue with JAVA_HOME not set on Travis Trusty image
 o now builds with Maven 3.0.5, 3.3.9, and 3.5.2

mojohaus/tidy-maven-plugin