fix: compass debug only if initialized (get rid of 'uninitialized constant Compass' when running mvn -X without compass enabled)
fix: set template_location and css_location to override default (removed: adding first resource again in WatchMojo, otherwise this location will be watched twice)
dry: UpdateStylesheetsMojo/WatchMojo -> execute script moved to super method executeSassScript
WatchMojo UpdateStylesheetsMojo simplified
CompilerCallback instead of CompilationErrors. Report compiled scss, detected changes and errors to maven log on the fly