Implemented authoring with new UI forms. Implemeneted user registration. Ship bugfixes.

This is a huge changeset, containing a lot of changes  that were made during previous week. Those are:
1. New authoring UI forms: create/edit timeline forms, create/edit exhibit forms, create/edit content item forms..
2. User registrations, registration forms,
3. Ship bugfixes.
4. New UI Chrome,
All commites were rebased, so history is clean.

__List of fixed bugs:__
#306. Dates in Cosmos Exhibits are displayed negative using long form
#313. Fallback: Fallbackpage rendering is broken 
#89. Timescale: "CE" instead "AD"
#100. Timescale: Incorrect mouse marker value 
#192. Timescale: Mouse marker: content overriding.

List of code reviews that were made for those changes:

Form UI for exhibits __APPROVED__
http://mrccodereview.cloudapp.net:80/ui#review:id=1131

Implemented canvas edit button for timelines  __APPROVED__
http://mrccodereview.cloudapp.net:80/ui#review:id=1133

ListBoxBase and ContentItemListBox implemented. __APPROVED__
http://mrccodereview.cloudapp.net:80/ui#review:id=1134

Content Item form.
http://mrccodereview.cloudapp.net:80/ui#review:id=1135

Listbox for exhibits form.  __APPROVED__
http://mrccodereview.cloudapp.net:80/ui#review:id=1140

Updated page header. Added new authoring edit form.  __APPROVED__
http://mrccodereview.cloudapp.net:80/ui#review:id=1141

Forms' navigation.  __APPROVED__
http://mrccodereview.cloudapp.net:80/ui#review:id=1142

Fixed CSS and visual appearence.  __APPROVED__
http://mrccodereview.cloudapp.net:80/ui#review:id=1144

Fixed few bugs with authoring. Fixed bug #306 . Some code rview fixes __APPROVED__
http://mrccodereview.cloudapp.net/ui#review:id=1147 

Timescale Bugfixes:
http://mrccodereview.cloudapp.net/ui#review:id=1148

Registration Forms:   __APPROVED__
http://mrccodereview.cloudapp.net/ui#review:id=1161

Authoring Forms Re-Write:
http://mrccodereview.cloudapp.net/ui#review:id=1162

Fixed Registration Forms: __APPROVED__
http://mrccodereview.cloudapp.net/ui#review:id=1163