[GEOS-6712]Add charset definition in HTTP headers when returning textbased responses
[GEOS-6374] Added support for non-default style on layer in layergroup
Merge pull request #793 from koordo/fix_wms_post_layergroup_styles

GEOS-6374 GetMapXmlReader always uses default style for layergroup layers
Merge pull request #788 from Damianofds/master-20141008-response_charset_management_improvement

[GEOS-6712]Add charset definition in HTTP headers when returning textbased responses