Remove trailing whitespace

Remove trailing whitespace from files identified by Pull Review.
"Trailing whitespaces are noise changes and can be sources of nasty bugs
in data entry" - PullReview.
Merge pull request #690 from jonathanyeong/master

Remove trailing whitespace
Clean up preference page, and give a better explanation
on why you're stuck on this page
Move link twitter button to somewhere sensible
Change how preference saves
Better dashboard - 2 cols
Map across the events page
Remove events link from user nav
Keep the event page split so you see more
Fix username overlaying on avatars
Fix pull request alignment
Fix coderwall badge line heights
Missed a spot
Fix floating in pull request listing
Merge pull request #694 from fhemberger/patch-1

Fix floating in pull request listing
Add .editorconfig http://editorconfig.org/
Merge pull request #696 from s10wen/master

Add .editorconfig http://editorconfig.org/
Merge pull request #692 from 24pullrequests/muan/nux

Page consistency
Link through to contributors list in readme

To save the authors list getting out of date after every PR
Merge pull request #699 from 24pullrequests/move-authors

Link through to contributors list in readme