Introduction of the Microsite feature which allows for limited multi-tenant branding on a subdomain basis, e.g. foo.edx.org and bar.edx.org

fix errorenous logic when running a microsite that could reside in a hosting environment with a marketing site in front of it

pep8/pylint fixes

address PR feedback, remove underscore from test hostname

more pep8/pylint cleanup. Skip test_microsites test, it works on localdev, not on Jenkins. Need to talk with QA team

manually add Ned's single-to-double quote fix

change aws.py runtimes so that the microsite_dir that is read from configuration is changed to a python path

Conflicts:
	lms/templates/help_modal.html

lms/envs/dev.py

@@ -130,6 +130,8 @@ SUBDOMAIN_BRANDING = {
     'mit': 'MITx',
     'berkeley': 'BerkeleyX',
     'harvard': 'HarvardX',
+    'openedx': 'openedx',
+    'edge': 'edge',
 }
 
 # List of `university` landing pages to display, even though they may not