September website changes - Pre-registration (#66)
* Factors rendering of external links into its own template. Automagical!
* Adds wagtail templates for keynotes on the front page
* Migrates to Wagtail 1.6
* Migrates content pages to be a streamfield. Flexibility++.
* Fixes editing of ContentPage bodies
* Adds floating images to content pages
* Fixes the layout of floating images
* Adds anchor links to content pages.
* Adds presentation link to the keynote speaker block model
* LCA-ifies the schedule list
* Refactors cms_pages/content_page into a new base template
* cms_pages/content_page now derives from abstract_content_page
* news_index_page now derives from abstract_content_page
* news_page now derives from abstract_content_page.html
* utility_page now uses the content_page base template
* Factors out _right_floating_image.html
* Themes the presentation detail page
* Themes the speaker profile page.
* Themes the schedule list page.
* Minor work on schedule_conference.html
* Themes schedule_detail.html
* Replaces cradle.svg
* Adds a background image to the schedule pages
* Adds libravatar fallback for speaker profile images
* Adds new background images (must update colophon)
* Adds some magic so that we can have slightly different presentation backgrounds for different pages.
* Adds the sponsor block to the bottom of the page.
* Adds sponsor logos to footer.
* All migrations are now in this tree
* Fixes wagtail migrations
* Adjusts presentation_detail to allow for miniconfs (i.e. no target audience)
* Adds unpublishing to presentation detail
* Adds ScheduleHeaderParagraph, which allows us to add some text to the header of schedule pages.
* Adds NamedHeaderParagraph. It allows us to store header paragraphs in the CMS.
* Date formatting in the schedule
* First step for fixing images
* Allows us to automagically load the colophon
* Adds “publish changes” button.
* Can login with email address