Getting Achievements ready for general use:
- Made new achievements to replace ones that were confusing or hard to use
- Made not using achievements the default state
- Testing a new system where in math 4 the body is hidden until the page is done rendering
Merge branch 'develop' of http://github.com/openwebwork/webwork2 into itemweaks

Conflicts:
	lib/WeBWorK/ContentGenerator/Problem.pm
Spelling ....
Tweaking how the hide until load thing works
reverting changes
An experimental change which hides the body until after everything is loaded.  (only affects math4)
Merge branch 'develop' of http://github.com/openwebwork/webwork2 into itemweaks
Added option to Course Configuration to enable achievement items
Merge pull request #161 from goehle/itemweaks

Achievement Item Tweaks