Convert Sparkle to ARC, take three.
Merge branch 'master' into ARC
Allow text to expand
Add .clang-format configuration file for source code formatting.
Use closure instead of info dict
Removed unused synchronous installation
Use constant for queue identifier
Merge branch 'master' into ARC
Change brace style to Linux
Force Xcode to use spaces on source code files.
Merge branch 'master' into ARC
Fix a release bug.
Merge branch 'master' into ARC
Localize "The update is improperly signed."

#294
Add a target to build Sparkle API documentation using Doxygen.
Fix some Doxygen warnings.
Convert normal comments to doc comments in SUUpdater/SUUpdaterDelegate.

Documentation will now show up for these classes in the Xcode sidebar
and in generated Doxygen documentation.
Merge pull request #351 from sparkle-project/doxygen

Documentation
Fix corruption of Xcode project caused by last merge.
Merge pull request #353 from sparkle-project/clang-format

Clang format