CLI Manager

CentralReport is designed to be easier as possible and friendly. The configuration is stored in a file (/etc/centralreport/centralreport.cfg) and can be edited with a text editor.

This pull request adds a "CLI Manager". This manager is a friendly way to configure and to manage your CentralReport software. The Manager will be able to :
- [x] Check the daemon status and the processus ID (PID)
- [x] Start or stop the daemon
- [x] Edit the web server port for the "Standalone app"
- [ ] ~~Edit the account token (CentralReport Online)~~

This Manager uses the **Urwid library** (http://excess.org/urwid/). This library is very powerful and so easy. In the future, we can imagine lots of new functions with this library (get stats in the CLI like htop? configure more options?).

The main screen:
![1](https://f.cloud.github.com/assets/1638158/983388/804b0648-0858-11e3-815c-b27e77b7bc52.png)

The manager accepts the new "wizard" option. This will be used during the installation, and displays two screens:
- A welcome screen like this:
![wizard 1](https://f.cloud.github.com/assets/1638158/851289/6d9cd7a2-f498-11e2-8d8d-cc861d8343b6.png)
- After, ask for the internal web server activation:
![capture decran 2013-07-23 a 23 26 56](https://f.cloud.github.com/assets/1638158/851295/80bf9e6e-f498-11e2-830e-2e6a582ade9e.png)

Some details:
- The manager must be executed as root in order to start/restart/stop the CR daemon and to write the new configuration file
- The configuration file is written automatically just before the manager ends (on selecting the "Save and Quit" button or with the CTRL+C)
- The manager requires that CentralReport is currently installed on the current host because it uses the binary script (/usr/local/bin/centralreport) to control the daemon. Moreover, we are sure that the folder which contains the configuration file (/etc/centralreport/) already exists.
- The manager is able to handle the POSIX signals, like SIGINT to end properly (CTRL+C)

In the first version, the manager will be able to:
- Check whether CentralReport is running and displays its PID number
- Start/Restart/Stop the CentralReport daemon
- Modify the internal web server configuration (activation and port number), called "Standalone app"