Update default_achievements.axp

Fixed some spelling errors
Merge pull request #144 from goehle/datetimefix

I took another look at everything and had a friend do some testing.  Everything looks OK so I'll merge.
Merge pull request #148 from goehle/hotfixes

Backport fixes
Fixed a bug where Scrubber was eating <'s  (2760)

Fixed incorrect text when viewing a problem via the library
Removing scrubber
Merge branch 'hotfixes' into devupdates

Conflicts:
	conf/defaults.config
	lib/WeBWorK/ContentGenerator/GatewayQuiz.pm
	lib/WeBWorK/ContentGenerator/Instructor/ProblemGrader.pm
	lib/WeBWorK/ContentGenerator/Problem.pm