ROO-3106: Spring Roo doesn't support new Java 7 language features

Added new dependency to eventually replace javaparser
ROO-3106: Spring Roo doesn't support new Java 7 language features

Added antlr4-runtime wrapper which is a dependency of antlr-java-parser.
Merge pull request #1 from mikedehaan/ROO-3106-support-for-jdk7

ROO-3106: Spring Roo doesn't support new Java 7 language features