adding ItDateTime class
add UserHelper class
Merge branch 'master' of https://github.com/hongkunyoo/it-em

Conflicts:
	It-em/src/com/pinthecloud/item/ItApplication.java
	It-em/src/com/pinthecloud/item/model/AbstractItemModel.java
Merge branch 'master' of https://github.com/hongkunyoo/it-em