Remove debugging statements in released 2.2-RC4 code

[Tembrel]

Some System.out calls in MediaType:

https://github.com/restlet/restlet-framework-java/blob/2.2/modules/org.restlet/src/org/restlet/data/MediaType.java#L1140-L1145

[jlouvel]

I removed the statements in master branch.

@thboileau Can you take care of 2.2 branch?

[jlouvel]

Fixed 2.2 branch.