zipped deck works
Merge branch 'dev' into feature/download-deck-zipped
making changes to the download deck
Added ability to handle zipped folders and media files relative to the excel file.
Added sort order to custom created card fields.
Added unit tests to test the extract-from-zip functions.
Refactored unit test for extracting zips
Adding zip test fixtures.
removing logs/apps.log from version control...
Added unit test for zip mappings.
Strip the media folder path info from files when creating zip for download.
Configure travis to fix log error
Configure travis to fix log error
Merge pull request #107 from Harvard-ATG/feature/download-deck-zipped

zipped deck works
Update .travis.yml
Merged dev into feature/logging. Resolved conflicts in services.py and views/deck.py