Tried applying SBD to other attributes...
Merge branch 'master' into sbd

Conflicts:
	doorstop/core/test/test_item.py
Using Literal for lines > 79 or with a '\n'.
Added wrapping.
Any '\n' should convert text to multiline.
Replacing single spaces on load.
Added .gitattrubtes
Refactored YAML conversion functions.
Sentences ending with parenthesis are still split. Not splitting numbered lists.
Cleanup.
Merge pull request #2 from jacebrowning/sbd

Fix sentence boundary disambiguation issues.