closes #318

Featuretags

Conflicts:
	lettuce/plugins/xunit_output.py

closes #305

Adjust Django docs because of new mail feature

The Django docs mentioned that Lettuce used the locmem backend. Update
the docs to reflect that this has changed.

Add Django email testing support

avoiding `None` filename and line number in step descriptions. It's an attempt to close #204, which seems to happen in windows

Print step that failed in verbosity=2

Document Django setup_test_environment

Conflicts:
	tests/unit/test_feature_parser.py

This commit adds support for inspecting emails sent that were sent by the Django server started by lettuce.

Add to the docs how the harvest command calls setup_test_environment, which changes the email backend.

They were partially based on the Norwegian translation. Norwegian
(Bokmål) is very similar to Swedish.

Translating an untranslated Norwegian string

Fix for issue #242 "xunit dies on undefined steps" WITH TESTS!

Fix xunit plugin. Merging through github interface because the xunit plugin is known by not being so reliable so no test coverage is required

Exception in case of an import problem is not helpful