Release 0.6.0

It's time to refresh the master! :)

Included in this release:

- **Improvement [#101](https://github.com/CentralReport/CentralReport/pull/101)**: URefactored web server and improved library dependencies
    * External libraries are now retrieved and built with Buildout
    * Web assets are now built with NodeJS and Grunt (and shipped already generated into the installer)
    * CherryPy has been replaced by Flask
    * The web package has been moved onto the cr.web
    * New version of the API
    * Frontend part is now using AngularJS
    * Frontend part has a new design (based on [CentralReport design](https://github.com/CentralReport/cr-design/)

- **Improvement [#103](https://github.com/CentralReport/CentralReport/pull/103)**: Improved README.md
    * Updated texts with the current project status
    * Added screenshots for the new web server design