Making email sending multi-site capable

Making email sending multi-site capable

Parameterize email footer adding SITE_URL as a configuration setting
PuMerge branch 'master' of https://github.com/Stanford-Online/class2go into dglance-site-templates
Change Multi-Site to New Structure

Change Multi-Site to New Structure
main/site_templates/Stanford/
also put sites in graphics and styles
Change to Multi-Site

Missed file
Multi-Site Move

Landing Page for UWA
Merge branch 'master' of https://github.com/Stanford-Online/class2go into dglance-site-templates
Merge branch 'master' of https://github.com/Stanford-Online/class2go into dglance-site-templates

Conflicts:
	main/templates/base.html
	main/test_harness/test_base_selenium.py
Merge remote-tracking branch 'uwa/dglance-site-templates' into sef-dglance-site-templates-move
Merge branch 'master' of github.com:Stanford-Online/class2go into sef-dglance-site-templates-move
added share block to right sidebar when reviewing an exam
Hides publishing model for videos and assessments from instructor #2319
Merge branch 'master' of github.com:Stanford-Online/class2go into kluo-2319-hide-draft-mode
Moves CSV submission download to celery task

Emails the CSV as attachement upon task completion
(closes #1997)
change file attachment to s3 download link due to size issues
Merge branch 'master' of https://github.com/Stanford-Online/class2go into giulio-share-results
more share block code
redirector fixes for wallawalla
Typo fix in a test file
added working twitter sharing
Merge pull request #2361 from Stanford-Online/jbau-wallawalla

Jbau wallawalla