Maven, NetBeans 7.4, Java 7

I've forked the project to try and keep it going, and hopefully fix a few bugs along the way.
Version numbering is as follows:
`major.minor.bugfix.netbeansrelease`

So, for this pull request, the version number is 1.0.0.RELEASE74-SNAPSHOT (`1.0.0` being the plugin version, `RELEASE74` since it builds against the RELEASE74 NetBeans dependencies, and `-SNAPSHOT` since it hasn't gone through `mvn release` yet)

I have not made any code changes yet - simply moved some files around to keep the Maven default folder structure and verified that the plugin builds and installs into NetBeans 7.4.

Per the comments in the NetBeans-generated POM, I have set the compiler's source and target levels to 1.7. This means the plugin will only build against JDK 1.7+