html changes
Merge branch 'master' into feature/deploy_url_options
deploy options changes (model and templates)
adds missing ">"
Merge branch 'develop' into feature/deploy_url_options

Conflicts:
	ab_testing_tool_app/models.py
	ab_testing_tool_app/views/stage_pages.py
missing quotes
code cleanup
adds open as new tab fallback to open as full page
cosmetic changes to better imitate standard tab redirect page
Merge branch 'develop' into feature/deploy_url_options

Conflicts:
	ab_testing_tool_app/templates/edit_stage.html
modified tests to pass for new feature
enables admin
adds missing newline
Changes labels on displayed text from "stage" to "intervention point"
Cosmestic fix to new_tab_redirect
comments added; cosmetic change propogated to window_redirect.html
deletes if block
small html changes; factored out get_incomplete_stages logic; passes additional incomplete_stages parameter to control panel
additional model on control panel
modal text change