Added fieldChanged action to the EdgeEnhancement, SilhouetteEnhancement, ToneMapped and Cartoon styles to allowing dynamic changes on the uniform values
Allow dynamic fieldchange to the basic parameters of each style
Corrected log error message
Fix for incorrect parameter name and changing comments
Set texture to dirty when a fieldChange is triggered from a texture defined under a volume rendering node type.
Check if the Volume Rendering component nodes are defined before setting texture to dirty,
Merge pull request #294 from aarbelaiz/fieldChanged

Allow dynamic change of style paramaters and textures