Add DataHelper helper methods.
This allows getting an instance by passing a context as well.
Fix EventTalks to pass a context when getting the DataHelper.
Fixes Crashlytics issue #28.
Fix TalkComments to pass a context when getting the DataHelper.
Fixes Crashlytics issue #26.
Fix EventDetail to pass a context when getting the DataHelper.
Fixes Crashlytics issue #29.
Update other uses of DataHelper to pass a context.
Merge pull request #10 from richsage/crashlytics-issues-feb-2014

Crashlytics issues feb 2014