Prefer no-arg cd to 'cd ~', remove incorrect Desktop path
Also remove Desktop dir from checklist page
Updates to May 2014 dates and crew
Added May 2014 instructors
Added intro to rails to the Curriculum nav bar
add Dan Pickett to instructors
update launch logo
Merge branch 'master' of https://github.com/railsbridge-boston/railsbridge-boston
Re-added link to Create Heroku Account page
Added a link to pre_workshop page with vagrant install instructions in case participant didn't install them
Merge pull request #150 from railsbridge-boston/less-tilde

Prefer no-arg cd to 'cd ~', remove incorrect Desktop path
Merge branch 'master' of https://github.com/railsbridge-boston/railsbridge-boston
Changed directions to create ~/workspace through Finder/File Explorer
and drag virtual box into it.  Less back and forth, groups the
command line steps together.
Update versions: VM (2014-05), Vagrant (1.6.1), VirtualBox (4.3.10), ruby (2.0.0p451)
Update example login banner and prompt