Release/2.9 Bugfixes

This is my misc bugfixing pull request for release/2.9.  If you want to test 2.9 (perhaps by following or even adding to the http://webwork.maa.org/wiki/Testing_Checklist ) you can post bugs here and I'll fix them and add them to the pull (as long as they are small.) 

Currently: 
- Fixed a bug where the latex mathview button wasn't associating properly to multiple essay boxes. 
- Cleaned up the collapse button a bit so it doesn't stretch the page and looks a little nicer. 
- Fixed the depreciation and experimental errors that were showing up on newer versions of perl.