Issue #166 Improve RESTful urls for web backend

Change create and delete urls for feeds and folders:

    POST /feed - Creates a feed
    DELETE /feed/:feedId - Deletes a feed
    POST /folder - Creates a folder
    DELETE /folder/:folderId - Deletes a feed
[tx-robot] updated from transifex
added javadoc for the businesslayer
[tx-robot] updated from transifex
Merge pull request #206 from xemle/restful-urls-for-backend

Issue #166 Improve RESTful urls for web backend
Update README (feed validation)
updated build tools, testacular is now named karma
move plugins docs into wiki
add license file
bump version to unstable
[tx-robot] updated from transifex