Merge pull request #4 from christoph-frick/master

Update to 7.0.6
cleanup
GPVAADIN-15 - updated to Vaadin 7.1.0
Changed versioning from 1.7.x to the version of Vaadin used in the plugin, e.g. 7.1.0.
demo for vaadin 7 updated
7.0.1.1 - init method from the vaadin service needs to be called before we start handling the requests
typo in version number fixed
git ignore updated
trying to replicate GPVAADIN-17
update to grails 2.2.3
updated to grails 2.2.3
WIP: added script to compile the vaadin widget set

currently this needs some attention and manipulation of the project.  the code
is based on the code from:

 https://vaadin.com/wiki/-/wiki/Main/Compiling+a+widgetset+in+grails

but adresses the following problems:

 - provide a proper class path, so the gwt.xml is picked up from src/java

 - read the widgetset from the VaadinConfig.groovy

to make it work in a project one needs to add the client compiler and the
addons to the compile time dependencies:

 BuildConfig.groovy:

 compile 'com.vaadin:vaadin-client-compiler:7.0.6' // vaadin version
 compile 'org.vaadin.addons:ckeditor-wrapper-for-vaadin:7.8.3' // e.g.