set EMAIL_USE_TLS to False by default (it should be overridden to True in the environments where it is supported, like QA)
added mailto links to email addresses
Adds draft versions of custom display error messages to settings, to be used with subclasses of RenderableExceptions; adds icommons_ui logging to settings files; updates project-level error page 500.html to show RenderableExceptions if rendered by the custom error page mixin
merged changes in /develop
Refactors 403, 404, 500 errors to a single error page 500.html to adhere to DRY principles
updates version requirements in prod settings
updates configuration to support new QA server as per https://wiki.harvard.edu/confluence/display/tltoperations/Preparing+Django+apps+for+automated+deployment
Move requirements files into project subdirectory.  Update .gitignore for requirements files with new location.  Fill in secure.py.j2 settings template file.  Update log file location for non-local environments.
Add missing newline.
Add missing newline.
moves canvas course site wizard error messages back into the application and out of the containing project ext_tools; also adds subject lines to emails if showing a renderable error
fixes issues brought up during PR 35 review
Merge pull request #35 from Harvard-University-iCommons/feature/TLT-426_custom_error_framework

Feature/tlt 426 custom error framework
merges updates from develop branch, resolves conflict with .gitignore
removes unnecessary secure settings, adds required ones for deploying to INT, QA, PROD via Jenkins
prod logs should continue to point to SITE ROOT
updates allowed_hosts to remove host filter
Merge pull request #36 from Harvard-University-iCommons/feature/TLT-424_automated_deployment

Feature/tlt 424 automated deployment
Merge pull request #37 from Harvard-University-iCommons/develop

Incorporating changes from sprint 10 and leftovers from sprint 9 for QA testing. Incorporates changes to provide better error handling on error pages, refactors error pages, supports building in Jenkins on new AWS servers.