Support a paperclip alias URL if a CDN URL is configured

Paperclip should use a CDN alias URL is one is configured.
Allow tool install instructions to be Markdown

Tool install instructions will now be rendered as Markdown. Since this
could potentially become rather lengthy and truncating Markdown won't
work so well this removes the install instructions from the tool
partial. Also auto_link tool descriptions with the help of rinku.
Merge pull request #719 from opscode/tool-markdown

Allow tool install instructions to be Markdown
Fixes the survey date

So the date was supposed to be July 31st, but I messed up and set it
later. This updates the site to end it sooner so we can get winners
notified.
Merge pull request #720 from opscode/cwebberOps/fix-date-surevey

Fixes the survey date
Support search toggle on mobile
Merge pull request #722 from opscode/search-toggle-mobile

Support search toggle on mobile
Merge pull request #713 from opscode/support-cdn

Support a paperclip alias URL if a CDN URL is configured
Persist a user's preferred cookbook install type.

When a signed in user clicks one of the cookbook install instruction tabs, save
their preference on their profile.