Tests, json resources, and convertible_formats

0.1.14 Nov 7, 2018

• Duplicated python constants/ definitions as json files under resources/ (for easier integration with frontend)
• Added tests to make sure python constants are in sync with json constants
• Implemented first_native_name helper (used to set channel names in chefs)
• Added list-like convertible_formats attribute for all presets
• Added html5_dependency and video_dependency presets
• Updated constant mapping with epub -- The EPUB preset is used with document content type
• Added the following language codes:
  • und = Undefined
  • mul = Multiple languages
  • arq = Algerian; Darja
  • lkt = Lakhota; Lakotiyapi; Teton
  • hdy = Hadiyya; Hadiya; Adea; Adiya; Hadia
  • sid = Sidamo; Sidaamu afii; Sidaama; Sidama
  • wal = Wolaytta; Borodda; Uba; Ometo