replace ant build with maven

known issues:
- build and use maven-plugin to build extensions in same reactor, but maven doesn't allowed it.
- most tests doesn't run (currently skipped)
- mixtests for core and webapp in webapp
use github as maven-repository
add travis-ci settings
add travis-ci settings

fix compiler settings and set requiered maven version to 3.0.0
fix travis.yml
add travis ci status 

skip ci
travis status use markdown

skip ci