Limit express dependancy to lt version 4

express up to version 3.5.1 works perfectly, but in 4.0 beta support
for configure() was dropped. This commit fixes this dependency.
Add Procfile.

Useful for heroku deployments, or packaging with https://pkgr.io
Merge pull request #154 from Stealthii/dep-fix

Limit express dependancy to lt version 4
Merge pull request #156 from pkgr/add-procfile

Add Procfile
Ignores the enter key in the filename text field
Merge pull request #157 from swang/ignore_enter_in_filename_field

Ignores the enter key in the filename text field
Cleanup some tabs/spaces
Update markdown.js, add highlight.js, implement highlighter with Github styling, set markdown sanitize true
Update ACE editor, Fixes #162

Uses release from April 11th, 2014 (04.11.2014)
Update dependency files
Merge pull request #164 from circuitbomb/master

Update markdown.js, Add code highlighting, Sanitize markdown
Merge pull request #165 from swang/update_ace

Update ace, Fixes #162
Fixed (HTML/PDF Export) : UTF-8 chars not rendered
Use require to include JSON config files
Cleanup of spacing, add space between ')' and '{'
Minor change to view Dropbox README properly
Added support for GitHub personal access tokens

This adds support for GitHub personal access tokens that are generated
at https://github.com/settings/applications

This is more for development, so right now no support for setting this
via an environment variable.
Adding traversal through GitHub repos/branches

This adds a link at the top to allow you to "go back up" one level when
you traverse your Github repos and branches.

Will have links, "Back to repositories" and "Back to branches for
<repo name>"
Update final compiled css/js files
Merge pull request #167 from swang/HBD2

Additions to GitHub plugin