Npm module support

Hello,

I added supports for 
- code documentaiton with docco
- code documentation publishing on github@gh-pages
- helper for release process
- automated test suites via mocha, not amazing, best a good start i guess
- an embedded webserver to quickly browse speedreports
- improved the readme
- added the package json file, so it is an npm module
- added a node module to locate the library path, useful to automate phantomjs
- i fixed a bug in speedreports file name, where the url contains : they are now replaced by _
- also fixed a bug where json file is empty

It would be great those improvements could be merged !

If you do merge,
Don t forget to adjust the Gruntfile.js in
          repo: 'maboiteaspam/loadreport',

I currently have built documentation on my repos,
http://maboiteaspam.github.io/loadreport/documentation/webserver.html
http://maboiteaspam.github.io/loadreport/documentation/schedule-loadreport.html

thanks for the scripts.

bye