Added traits (php 5.4) into the model.

Remove interfaces.
- ITaggable is replaces by TTaggable (trait for taggable repositories).
- BaseRepository is now abstract class, use @method for setters and getters (Nette 2.1)
Better specified of libs in composer.json
Add inline doc
First infractructure for the tests.
Improve of templates - highlight actual sections.
More columns in author grid
Nifty grid template better support for Bootstrap 3 (only hack)
Better form renderer modified for Bootstrap 3
Remove old file for Taggable, replaced by TTaggable