basic uploader, not finished yet
Multi upload
Merge branch 'uploder'

Conflicts:
	.gitignore
	backend/src/main/java/com/re/entity/RealEstate.java
	ui/pom.xml
	ui/src/main/java/com/re/components/realestate/REEditWindow.java
	ui/src/main/java/com/re/config/AppWidgetSet.gwt.xml
	ui/src/main/java/com/re/config/ApplicationInitializer.java
	ui/src/main/java/com/re/ui/RootUI.java
	ui/src/main/java/com/re/views/RealEstateView.java
MultiUploader