#838 update ParseKit to recommended project settings
#838 add ParseKit user data folder to gitignore file
#838 delete ParseKit user data from repo
#838 remove a warning
#838 move all paco icons from resources to config, delete legacy icon.png file
#838 use assets category to manage app icons and launch images, and it also removes the warning of "Missing Retina 4 launch image"
#838 migrate to XCTest
Merge pull request #840 from google/issue838

#838