Merge branch 'master' into development

* Catch development up with changes to .buildpacks on master.
Change video_file to file_source for readability.
Change video_name to filename for readability.
Change variable start to gif_start_point. Change duration to gif_duration for clarity.
Change target_path to video_storage_path and gif_path to gif_storage_path for readability.
Reorganize upload route for better readability.
Replace video_title with strip_filetype(filename).

* Although this is more wordy in line, it seems to improve the clarity of intention, as opposed to an opaque distinction between filename and video_title - which really only had to do with the presence or absence of an extension.
Merge branch 'improve-readability' into development

Improve the readability of the groundhog_app file.
Merge pull request #18 from JonathanTR/development

Development