Views cleanup part 1.
Refactor renaming objects and moving them out of views.py
Tweak to URL file type matching.
Rough functioning get file size from S3 bucket.
Comment out print statements.
Clean-up of file URL variables and some comments.
Add more data to the response.
Refactor S3 object metadata parsing for possible future expansion.
Test for S3 object metadata parsing.
Tests for DOI value conversion of eLifeFile object.
Merge pull request #14 from gnott/rest-framework

Rest framework - PDF file size