Windows console mode modifications

Hi,
this is my first commits ever ... so please be indulgent if something is wrong in it and feel free to inform about how it should have been done :-)

As I am currently using Shinken on Windows, I made a bunch of minor modifications to improve user's experience. So I propose those modifications : 
- debug logging for the checks launched by the poller. Really convenient when setting up a new configuration ...
- Windows command line scripts to manage the Shinken start/stop and to set the position of consoles for all running daemons.
- coloured console text depending on log level in the Windows consoles

![capture](https://f.cloud.github.com/assets/2932687/616364/5bd17144-ce6a-11e2-9c0d-855e7e2d4dab.png)

 Best regards, Fred.