LUN-1151: max length for credit text should be 30
Merge remote-tracking branch 'origin/master_pbs' into LUN-1151

Conflicts:
	filer/tests/models.py
Merge remote-tracking branch 'origin/master_pbs' into LUN-1151

Conflicts:
	filer/tests/models.py
Merge pull request #29 from pbs/LUN-1151

LUN-1151: max length for credit text should be 30