Refactored file content type discernment from add_datastream and modify_datastream into private method.
Added better support for Rails uploaded files by calling :content_type on file if available.
Added constant for default content type.
Removed Ruby 1.8.7 workaround.
Added tests!
Fixes #61.
Merge pull request #62 from dchandekstark/mimetype-in-add-or-modify-ds

Refactored file content type discernment from add_datastream and modify_...
Bump version to 1.7.1
Add unit test for batch loading datastreams
Merge pull request #64 from projecthydra/test_batch

Add unit test for batch loading datastreams
test batched ds profile responses separately in IT and unit tests
Merge pull request #63 from barmintor/test-profiles

test batched ds profile responses separately in IT and unit tests