Add Procfile

Add Procfile to run cube-dashboard on Heroku, or using foreman locally.
Add CUBE_REMOTE_FILE to be able to pass config file

Allow config file to be loaded from a remote URL by setting the
CUBE_REMOTE_FILE environment variable.
Allow config in DASHBOARD_CONFIG environment variable

Allow dashboard configuration to be set in a new environment variable,
DASHBOARD_CONFIG.  This allows the configuration to be kept out of
version control.
add versioned dependency for node
Require a signed request to access dashboard

Require a signed request from a Canvas app on Salesforce to access
dashboard.
set default step to 5 minutes
update express version
Send Authorization headers to cube evaluator

Cube collector is using signed_request authenticator.  Send
Authorization header with base64-encoded SHA256 HMAC signature and JSON
object identifying user.
Make signed_request cookie secure
Valid email address in signed request
fix node version
Update unauthorized message and remote extra whitespace
ignore config.json
Clean up formatting
version bump to v0.0.6 works with node v0.10.x

- Adds a new version of node-static to package.json
- Adds .resume() for node v0.10.x streams, also appears to
  work with older versions of node. (tested with v0.8.8)
Merge pull request #9 from godsflaw/master

Fixes cube-dashboard under node v0.10.x
Set npm version
Merge branch 'signed-request-authenticator'
Add Procfile for local development using config.json
Only mark cookie secure if serving page over https