removed StringUtils/StringCategory because it's already merged to groovy
installed gradle wrapper of version 0.9.2
updated gradle wrapper to 1.4
removed @Equiv because it's already supported by groovy as @EqualsAndHashCode
removed ObjectCategory because ObjectUtils can be used as category class.
added META-INF/**/ExtensionModule
upgraded groovy to 2.1.1 and junit to 4.11
removed pom.xml
added byte[]#dumpHex() by DumpUtils.dumpHex(byte[])
upgraded groovy to 2.1.9
upgraded gradle to 1.8
upgraded gradle wrapper to 1.8