added volunteer details textarea to new event form

[fixes #45628531]
fixed broken css selectors in spec.  have no idea why they were passing before
Organizer dashboard shows number of checked in RSVPers per session.
Add link to GitHub issues in nav bar
Merge pull request #121 from lilliealbert/master

Add link to GitHub issues to nav bar
Remove vol skills from event show page
Modified page header markup to not conflict with flash msgs

Increased width of textareas
Upgrading Rails to 3.2.13
Default session RSVP checkboxes to checked
update to ruby 2.0
Update to capybara2.

  Update related gems and add capybara-screenshot.
Update Ruby in Gemfile to persuade Heroku to use 2.0
Update bootstrap script to reference Ruby 2.0 and better check Meetup creds
Improve confirmation email to actually mention Bridge Troll
Give the bridge troll a nicer Email Name