Cleanup java script usage

[stheophil]

• [x] use http://requirejs.org/ to organize / optimize growing number of javascript libraries
• [x] use the Play javascript Routing support and remove the manual AJAX routes, see http://workwithplay.com/blog/2013/06/05/integration-with-javascript/
• [ ] the javascript routes object should be combined with other javascript methods that other's might find useful into a "client.js" library. Developers who want to load wahlversprechen data should be able to do so by loading the client.js library from our server and calling that instead of assembling manual AJAX calls
• [x] split the current wahlprogrammometer.js into a ui.js and a editing.js library. The first contains the javascript code we always need, the later we need only when a user is logged in
• [x] use mustache for shared client/server side templates

[mknecht]

Should I open a ticket for an independent client.js? jQuery might be an acceptable dependency, but our internal jsrouting module surely is not.