added link to github for contributors on the homepage
added twitter follow button to the bottom of talks page
Merge branch 'master' of https://github.com/mootpointer/rubyconf_miami_hub

Conflicts:
	source/index.slim
modified copy for contribution CTA on homepage
added modified ninefold sponsor message
edited contribute message on front page and twitter follow button. Header image responsive
Merge branch 'master' of https://github.com/mootpointer/rubyconf_miami_hub
Add Nell's summary
Remove nav cruft
Add previews for Emily and Loren
Add indicator of talks with previews
An attempt to make the hub more mobile friendly.
Fix planner icon for previews
Add Andre's preview
Add gustin's preview
Add Koichi's preview
Add notes folders to all the talks
Add talk notes call to action
Add Sam's Preview
Make the planner select the day of the talk or event being viewed.