Revert "extras/osx: switch to update-test.v.o so we can provide beta updates for 2.1"

This reverts commit ce972e181e5b8df061cb0b9912e66024690e4887.
macosx: Update Sparkle Appcast URL as we won't provide fat binaries for the foreseeable future anymore
s/informations/information
macosx: minor code cleanup
extras/ios: don't use small contribs anymore
ffmpeg/libav: allow the use of 'thumb' if we don't specify 'small'
postproc: allow the use of 'thumb' if we don't specify 'small'
quartztext: fix relative font size handling
extras/package: compile quartztext module for iOS
extras/tools: disable contrib compilation of gpg-error, gcrypt and lua since we don't use it for now
Fix grammar in comments
Qt: fix mismatched <p> tag