Remove Greasemonkey support
Refactor browser-specific postMessage code into RESUtils.sendMessage
Simplify setUpRESStorage with RESUtils.sendMessage
Remove unused GreaseMonkey methods, move GM_addStyle to RESUtils
Minor style fixes
Merge pull request #718 from mc10/style-fixes

Minor style fixes
Merge pull request #714 from mc10/greasemonkey-removal

Fully remove Greasemonkey support