Adds abstract class for plugin providers
Fixes coding style and removes debug output
Merge branch 'master' of https://github.com/Arcavias/arcavias-core into 2013-08-13RefactorPluginsAddAbstractClass
Fixes minor issues in plugins
Merge pull request #275 from dahoffmann/2013-08-13RefactorPluginsAddAbstractClass

Adds abstract class for plugin providers