Add BOM and split the master pom to -metadata and -with-dependencies poms

 * similar aproach as used by KIE to avoid the chicken-egg issue with bom
Fix KIE -> UberFire leftovers from code migration
Merge pull request #15 from psiroky/bom-0.3.x

0.3.x: Add BOM and split master pom to '-metadata' and '-with-dependencies' poms