Ability to create style in workspace with SLD version 1.1.0

[nilgundag]

GeoServerRESTStyleManager has many overloaded methods to publish a style in a workspace. Yet all of them assumes content type "application/vnd.ogc.sld+xml".

Functionality to check sld version is already available in the same class.

if(!this.checkSLD10Version(sldBody)){
    contentType = GeoServerRESTPublisher.Format.SLD_1_1_0.getContentType();
}

It should be trivial to update all methods to check SLD version and use the corresponding content type.

[wumpz]

I provided a publish method with a format parameter and try to guess the format from the givens file extention within my fork. You could try this modification but its still alpha with all the other changes I introduced (at least for my needs).