implemented collapsible custom cells in filter view
refactored to use htk's Yelp lib and moved API keys to secrets.xcconfig
updated README
got results table view looking better
implemented autolayout constraints on results table cell, but some remaining conflicts
added rating image
rounded corners for business
add search bar in navigation bar
refactor utils
filters view
updating screencap
Merge pull request #4 from jontsai/master

more progress updates to yelp app