Normalize the Xcode project tree.

The INAppStoreWindow library is now at the root level.
Move Extensions into the INAppStoreWindow library folder.
Organize the file hierarchy in a more manageable and logical fashsion.
Remove user-specific file that does not belong in Git.
Fix project name in workspace.
Merge pull request #166 from petroules/organization

Organize file hierarchy and Xcode project tree into something more manageable and logical.
Add a property to get the window's title divider.
Add support for managed bottom bars.

Closes #165
Remove unnecessary getters for synthesized properties.
Fix many code style violations.
Merge pull request #168 from petroules/enhancements

Add support for managed bottom bars.
Fix build with the 10.7 and 10.8 SDKs.
Enable backwards compatibility on example app XIBs.
Let SampleDocumentApp deploy to 10.6.
Merge pull request #170 from petroules/backwards-compatibility

Fix build with the 10.7 and 10.8 SDKs.
Avoid using magic strings in CoreUI renderer.

Get real values from the system; use backup values if they disappear.
Fix bottom bar height slider in sample app.
Merge pull request #172 from petroules/coreui-improvements

Avoid using magic strings in CoreUI renderer.
Update podspec for INAppStoreWindow 1.5.
contentViewFrame check for hideTitleBarInFullScreen to adjust the content view correctly.