Merge branch 'release/20140604-release' into develop

* release/20140604-release:
  bump version to 0.0.3
use own center implementation instead of relying on jquery
Merge pull request #4 from cedrics/include_center

use own center implementation instead of relying on jquery
allow to extend filters multiple times

fixes #6
do not isolate the resourcebrowser, because the SDK does not yet support it

fixes #7
update to ruby version 2.1.2

* cleanup gitignore
* add rake to development dependencies
* remove unused application layout
minor improvements

* better stabability on upload
bump version to 0.0.4
Merge branch 'release/20140804-release'

* release/20140804-release:
  bump version to 0.0.4
  minor improvements
  update to ruby version 2.1.2
  do not isolate the resourcebrowser, because the SDK does not yet support it
  allow to extend filters multiple times
  use own center implementation instead of relying on jquery