Keep old namespace and framework's bundle ID for backwards compatibility

Partial revert of f916f2e723fd387cc07a12b243fa9981130eefee
Merge pull request #340 from sparkle-project/publicidentifiers

Keep old namespace and framework's bundle ID for backwards compatibility
Switched SUUpdateAlert.xib to AutoLayout
Remove the left alignment on the description text.
Copied align to other XIBs
Merge pull request #337 from pornel/autolayout

Switched SUUpdateAlert.xib to AutoLayout
Fix a bug pointed out by the Static Analyzer.
Merge pull request #344 from MaddTheSane/staticFix

Fix a bug pointed out by the Static Analyzer.
Restore original Sparkle icon.

This reverts: 984aac852f45d34a7fa22c4e63930047a7891de9,
93ebf843c2b896c4ee0222bea669602a49f922fe,
8d2054e62a1df873f4fd5ccc64f2b12d94f807e5,
1325d3fe40addf019ff94f3f23314eb8589a50b9,
2579f2c3a34172d368df8c87a59e45ee417a394c,
and partially reverts 6ca5c3a3379e2bc7f7a8967c9e91fefb29cf438c.

This icon belongs to a third party and should never have been merged.
Added window autosave identifier

Fixes #52
Use single line mode on textfield that AutoLayout can’t wrap
Make the repository significantly more organized.

Now everything is not pretty much all in one directory.
Fix output encoding in localizable strings Makefile target.
Add Xcode and Makefile targets to build a Sparkle release package.

Use `make release` to build Sparkle and create a Sparkle-VERSION.zip,
ready for upload.
Clean up Xcode configuration.

Make use of inheritance by applying ConfigCommon to the root node and
move all UI-applied settings into xcconfig for easier management.
Use new operatingSystemVersion API when available.
Silence warnings that only seem to be appearing due to a compiler bug.
Make Sparkle README icon 96x96 to display properly on Retina.
Use asset catalogs and add more Retina-compatible icon sizes to ICNS.
Add .clang-format configuration file for source code formatting.