add coimotion.plist for settings

Define variable/key/paramter name for using in app, initialized in
appUtil.
coimotion.plist saves the information for API calls to commotion
LoginViewController is modified to replace hard coded strings
Display locations on Map

MapListingViewController shows the locations.
click on pin show the information of the location, and display a
disclosure style button for detailed view.
mapAnnotation class is for annotations on MapView