GWTII-154: apply widget mvp structure to print plugin of gwt2; separate
functionalities in different classes; add examples and documentation
GWTII-154: typos in example messages
Merge branch 'master' into GWTII-154_printPluginMvpSquash

Conflicts:
	plugin/wms/print/src/main/java/org/geomajas/plugin/wmsclient/printing/client/WmsLayerBuilder.java
Merge pull request #38 from geomajas/GWTII-154_printPluginMvpSquash

GWTII-154: apply widget mvp structure to print plugin of gwt2; separate