added basic constraints for the layout of table
added yelp constants. updated viewcontroller to create instance of yelp client
hooked data source for table view
added base_url to constants
saving half done work!
basic data fetching hookedup
most basic auto layout setup for cell
added more contents to each business listing
updated to access key only if it exists
updated to add search bar in the title view\r\n It seems to be clipped, need to work on nicities
Saving network call if we know there is no real url
updated search bar