Fix directory separator so tests pass on Windows
Merge pull request #205 from robmaurer/patch-1

Fixes directory separator so tests pass on Windows
Add support for bullshit IE8 mimetype. Closes #209
Fix FileImportBehavior
Fix error while saving related model without file
Fix two doc comments
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Proper spacing
Add spacing
Fix tests
Fix spacing on switch statement
Match method signature
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Add missing comment
Remove extra space
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