fixed settings files so that the lecture video tool uses the QA commons api for test, qa, and demo and uses the production api for prod.
Merge pull request #138 from Harvard-University-iCommons/feature/fix_settings_for_icommons_api

fixed settings files for lecture video
Introduce new secure setting for the base url of the icommons api since the user and pass are tied to an instance.  Convert lecture video tool and icommons_common settings block to use this new api_host setting and also move them to base since settings are identical or very across environments.  For the canvas_url part of the common block, override the canvas url per environment (defaults to canvas.icommons.harvard.edu).
Merge pull request #140 from Harvard-University-iCommons/release

Mergeing release back into develop for hotfix to fix lecture video exceptions
Merge pull request #139 from Harvard-University-iCommons/feature/modify_api_urls_to_be_consisten_across_environments

Introduce new secure setting for the base url of the icommons api since ...
Merge pull request #141 from Harvard-University-iCommons/develop

Mergeing from develop into release