Fixes #257 - User account switcher broken
Adds new RESUtils function to delete cookies in a cross browser
way. Includes deleting the reddit_session cookie which fixes
the account switcher. Tested on Chome, Firefox, Opera and Safari.
Could probably do with more testing before merging
Currently we have a bug when a user isn't logged in
which was added in commit 96f814e825713d7f4e6d8cd170a9e22391bc47fb
Revert "Currently we have a bug when a user isn't logged in"

This reverts commit a42c9cfda247457dca5d97caa7bad7bab9cc4071.
Proper fix for the toUpperCase error
Fixes #260 as discussed - easier to merge this pull than two pull
requests
Merge branch 'master' into issue_257

Conflicts:
	lib/reddit_enhancement_suite.user.js
Merge pull request #258 from patricksnape/issue_257

Fixes #257 and #260 - User account switcher broken