Fixed for..in loop in Linux collector

Yeah, RTFM... In Python, we must specify on which item we want to iterate in a directory (key, values or key/values)
http://stackoverflow.com/questions/3294889/iterating-over-dictionaries-for-loops-in-python/3294899#3294899
Merge pull request #102 from CentralReport/fix-disk-collector

Fixed for..in loop in the Linux collector
Publishing version 0.5.1
Replacing CherryPy by Flask framework

WSGI used: Werkzeug.
Moved web package into cr.web
Added Gruntfile to generate front assets
Removed compiled front assets from version control
Cleaned api route and added GET /api/checks
Minor fixes in collectors
Working on AngularJS for the web dashboard
Added dynamic refresh in front view (interval based)
Excluded 'bower_components' from version control
Improved front part (working on AngularJS)
Added /api/host route and implement run method in AngularJS to load system data starting the js app
Added Angular filters and improved js functions
Improved web services and related front UI
Add OS Family and Variant in /api/host

+ Dynamic OS icon in the front dashboard
Many improvements in the web server part (API, Angular, etc.)
Updated itsdangerous library
Removed Python Zip libraries and added dist/ directory

This dist directory will be used to compile Python and web dependencies.