Remove unused ressources.

Fixes #93.

Remove following ressources:

- jQuery (outdated version 1.8.3 and already provided by CDN)
- Bootstrap (outdated version 2.0.2 and already provided by CDN)
- jQuery-charCount (css not used, min.js is broken)
Merge pull request #109 from mvitz/remove-local-ressources

Remove unused ressources.