Merge pull request #1 from NextfazeSD/master

Added some usage instructions to README. Remove references to didLaunch.
Changed alert button text from "Upgrade" to "Update" to match alert title.
Merge pull request #2 from NextfazeSD/master

add delegate callback for error when parsing json file
Incorporate a few improvements made for other projects back into ManUp
changed delegate property to weak (assign)
fixed compiler warning by changing int type
Merge branch 'master' of https://github.com/NextfazeSD/ManUp