Merge pull request sparkle-project#481 from MaddTheSane/useModules

Have Sparkle build a framework module.

Updated changelog

Changelog

Sorted Xcode config

Updated sample appcast to be appropriate for DSA signatures being req…

…uired.

Fixes 251968

Sparkle now requires custom feed parameters to include a "displayKey" and "displayVersion" key. These will be displayed to the user in the initial permission dialog so that he knows what he's getting.

Bumped version number to 1.5b4. Siiigh...