Fix Bug 980792, make django form errors more user friendly
Merge pull request #1944 from ossreleasefeed/bug980792-improve-error-messages-on-gccrashes

Fix Bug 980792, make django form errors more user friendly
Merge pull request #1952 from peterbe/bug-983194-pyflakes-2014-spring-cleanup

fixes bug 983194 - pyflakes 2014 spring cleanup
fixes bug 908214 - replace self.assertRaises with assert_raises, r=AdrianGaudebert