Fixing maven dist files

With this pull request, applied only in blank-project yet, will solve problems we have by now when generate dist files. From now we generate 2 files: one for Eclipse users with all jars, and another with a pom.xml to help Maven users.

The problem: we pack a pom that contains plugins and other tasks only used by vraptor devs. So in the package time, an ant task copy and change pom with some hacks to pack a right pom.

After revision I can apply this changes to musicjungle too.

Closes #617