Recursively initialize submodules when running on Travis-CI.
Recursively initialize submodules when running on Travis-CI.

podkovyrin/Parse-SDK-iOS-OSX,gonzalonunez/Parse-SDK-iOS-OSX,ParsePlatform/Parse-SDK-iOS-OSX,natanrolnik/Parse-SDK-iOS-OSX,ParsePlatform/Parse-SDK-iOS-OSX,dvanwinkle/Parse-SDK-iOS-OSX,podkovyrin/Parse-SDK-iOS-OSX,gonzalonunez/Parse-SDK-iOS-OSX,dvanwinkle/Parse-SDK-iOS-OSX,natanrolnik/Parse-SDK-iOS-OSX