Merge pull request #86 from openwebwork/hotfix1

Hotfix1
Update math4.css

Addressed bug 2647
Fixed broken disabled buttons
Merge pull request #96 from goehle/upgraded2.7

Fixed broken disabled buttons
Merge pull request #143 from mgage/develop

fix two minor bugs in FileManager.pm
Fixed some issues with the timedatepicker functionality.  In particular time zones are no loger hard coded.
Removed inintended warn
Modified datetimepicker so that it doesn't constrain what people can type.
Merge branch 'datetimefix' into devtimedatefix

Conflicts:
	lib/WeBWorK/ContentGenerator/Instructor/ProblemSetDetail.pm
	lib/WeBWorK/ContentGenerator/Instructor/ProblemSetList2.pm
	lib/WeBWorK/Utils/DatePickerScripts.pm
Update ContentGenerator.pm

Fixed minor bug
Added ability to turn date picker off in the course settings
Merge branch 'develop' of http://github.com/openwebwork/webwork2 into devtimedatefix
fixed unintended change
Update default_achievements.axp
Have had complaints that people dont like that the Cancel Edit/Cancel Export/etc... tabs are the default.  I changed the save tabs to be the default.
Fixed some for loop errors in the item code
Fixed some bugs
- Made a nicer error message when using "stop acting" on the answer log page.  It still "forgets" the student set and problem you were looking at, though.
- Fixed an issue with mathview not using existing permission variables
Merge pull request #145 from goehle/devtimedatefix

Devtimedatefix