after login success redirect to refrence page
fix some problem of comment and shoppingcart
Merge remote-tracking branch 'origin/jspImpl' into jspImpl

Conflicts:
	src/main/java/edu/cmucdu/ecommerce/domain/product/SellerProduct.java
	src/main/java/edu/cmucdu/ecommerce/web/custom/ProductDetailController.java
Merge branch 'jspImpl' of https://github.com/dto80/CDU_CMU2.git into
jspImpl