Added support for LayerGroup to the WMS GetLegendGraphic action
fixed some bugs and added forceTitles legend option
fixed layer, style and rule parameters size mismatch; fixed tests not running on linux
GetLegendGraphic LayerGroup: fixed issue with fontAntiAliasing legend option
Merge pull request #90 from mbarto/getlegendgraphic_layergroups

Added support for LayerGroup to the WMS GetLegendGraphic action