Vid 2032 Adding Bucky tracking to UserLogin

- Added bucky tracking to user login dropdown (in the header) and modal (access by clicking on chat link when logged out). 
- Added graphs here http://graph-s3.wikia-prod/grafana/#/dashboard/db/Liz%20Dash (under UserLogin JS). 
- Fixed files I touched to conform to coding conventions. 
- Moved up loading of bucky assets so they would be available in extension JS. 

Note: there's a bunch of whitespace changes so https://github.com/Wikia/app/pull/4995/files?w=1 would be helpful. 
@wladekb