Added rich text editor instead of markdown

Changed markdowns to rich text editor. 
Installed CKEditor as a rich text editor.
![screenshot from 2014-06-28 16 24 00](https://cloud.githubusercontent.com/assets/5913886/3421827/3b776dda-ff02-11e3-9fb1-f1724daec961.png)

Yes, we can safely remove these files as long as nobody tries to upload a file with CKEditor which is impossible because it upload feature is disabled and there is no database tables for attachments. The reason I left it there is that maybe LLC might need this in future.