Only allow a single fetch_commits job at a time.

Fixes #280.
Remove dependency on pry, freeing up open4 ~>1.0 for use
Enable a 3 month commit search window
Minor updates to install script and vagrantfile
Fix a bug with syntax highlighting

We need to refer to a lexer by alias, even if the lookup matched on
filename.

Fixes #466.
Fix new vagrant box url
Back to lucid vagrant until we merge ubuntu-precise branch
Upgrade Vagrantfile for use with vagrant >=1.1

Fixes #442
Disable session hijacking protection

This should fix broken Chrome 37+ sessions
Merge pull request #497 from mikejquinn/fix-chrome-sessions

Disable session hijacking protection
Encode Text as UTF-8 before highlighting (fixes #468)
Merge pull request #498 from JaCoB1123/master

Encode Text as UTF-8 before highlighting (fixes #468)
Add clojurescript syntax coloring
break install script on error (e.g. dpkg already taking the lock)
Merge pull request #501 from opatry/patch-1

break install script on error
Merge remote-tracking branch 'upstream/master'