E19, E10

Update MenuActivity to adopt MenuItemAdapter
     - Display both name and price of the item now
Update VendorActivity
     - Disable view menu button when no menu item is available
     - View Reviews is now functioning
Add 0 to 5 stars pictures
Add ReadReviewActivity, ReviewAdapter
Add VendorReview object
Update Cart and Order .java
Merge pull request #2 from Intuitive/Zeng-Sprint2

Zeng sprint2
added CartActivity, E17, E13
fixed remaining conflicts
Merge pull request #4 from Intuitive/Fifi2

Fifi2
Added docs for Sprint3
use rest service to get json from backend
made compatible with API 11, added REST service & integrated with Vendor
search
Merge pull request #5 from Intuitive/edgar

Edgar
added hardcoded Menu back to VendorActivity
Merge branch 'master' of github.com:Intuitive/YummyAndroid
Update cart button
Remove ONE Empty Space Line~.~
Change Launcher Logo
removed Cart button from OrderConfirmationActivity, put hours dummy data
back in
updated docs
abstracted out Rest services and Model behavior
finished implementing RestService
renamed packages to plurals