JDK 6 Support

Downgraded do JDK 6, which is recommended for IntelliJ plugins.

First release

Supports constructor and setter injection. Given a java bean with an explicit constructor (with arguments) will use that constructor (chooses a biggest constructor), otherwise will use setters. When using setters, user can choose what setters to include in the generated builder. When no setters are selected still generates a builder that has just the build() method.