Namespace the translate tag to `attendease_t` so that it doesn't conflict with other plug-ins that may provide `t`.
Update all occurrences of `t` to `attendease_t`.
Merge remote-tracking branch 'upstream/master' into fix/attendease-translate-tag
Merge pull request #57 from pgib/fix/attendease-translate-tag

Namespace the built-in translation tag
Merge remote-tracking branch 'upstream/master' into version-0.6.12

Conflicts:
	templates/attendease/schedule/sessions.html