Tried to simplify markers.
Merge branch 'master' of github.com:ahn/vaadin-aceeditor

Conflicts:
	aceeditor/src/main/java/org/vaadin/aceeditor/gwt/client/AceMarkerEditorFacade.java
	aceeditor/src/main/java/org/vaadin/aceeditor/gwt/public/ace-vaadin-markers.css
	aceeditor/src/main/java/org/vaadin/aceeditor/gwt/shared/Marker.java
Comment.
Updated demo.