added method to get assertion property uid and recipient in utils.py
included 2 more properties badge and issuedOn in utils.py
Merge pull request #13 from karthikbangera87/master

# Issue 12 resolution.  Thanks Karthik!
Changes to the get_assertion_properties method to return json object
Changes to get_assertion_properties method in utils.py to return a dictionary of a few properties of the assertion URL
modifications to get_assertion_properties method to return a json object to get_image_for_assertion method and utilize the json object to return an image of the assertion
Verification of the badge field to check if its URL or badge object and return appropriate results
Clean up utils.py changes
Remove obsolete test
Merge branch 'utils.py_feature'