Added test case for import command. Fixes #87
Altered import function for Bag to match the new model changes
Added additional tests for BagAction model
Merge branch 'master' into inventory-import-tests
Merge branch 'master' into inventory-import-tests
Added method convert_datetime to convert timestamp formatted strings to datetime objects. Fixes #88
Modified test cases to test the modified import command for date and datetime objects. Fixes #88
Merge branch 'master' into inventory-import-tests
Also edited tests by adding tearDown() function to import testing class, as well as PEP8 style changes

Conflicts:
	inv/invapp/tests.py
Merge pull request #92 from gwu-libraries/inventory-import-tests

Inventory import tests