lots of changes to slims, including work mode
Merge branch 'master' of github.com:wmleler/jrslims

Work mode only applies to the current browser on the current computer.

Fixed a bug that was making the emoticons and special characters show up in the wrong place.

Updated the file uploader to the latest version. As El found out, there is a serious bug in iOS 8.0.0 that prevents it from uploading any files at all. Sorry, not much I can do about that. Upgrade to 8.0.2.

Rewrote the logic for marking messages read. When you click on a message now, it will show that message read in all running copies of Slims (like if you have two browser windows open on Slims, or two different browsers on the same machine, or even on different computers). This fixed the bug that was causing Slims to not remember the last read message in some cases (Firebase bug).