Add bundler bits to gitignore
Add in .ruby-version for those using rbenv
:droplet: Adding logo for Blue Drop Cookbook; Better stacking of logos on mobile.
:kissing_cat: adding link to schedule on sessions page.
Merge branch 'master' into gh-pages

Conflicts:
	css/partials/design/sponsor-logos.css
	css/style.css
:snowflake: deploy script