Now with hybrid!

Since the last request, I've done the following:

- Integrated all of the Hybrid SDK projects into the `SalesforceMobileSDK.xcworkspace`.
- Converted the SalesforceHybridSDK project into a standard static library project--no more SalesforceHybridSDK.framework; it's libSalesforceHybridSDK.a now.
- Simplified the hybrid test projects down to one project--two, technically (test app + tests project).
- Removed all of the submodules except Cordova and the ThirdPartyLibraries submodules.  Cordova is now pulled into the workspace as a first-class citizen, and linked through like everything else.  You can now debug native and hybrid apps all the way through!
- Did some miscellaneous cleanup on the hybrid sample apps, around project structure.  I think the projects should be cleaner to look at / work with now.

This represents the end of the first phase of the Mobile SDK cleanup for iOS.  The workspace is fully functional, and I recommend working out of the workspace for 2.0 development, going forward.  The only requirements for working with the SDK in this model are a) cloning the repo, and b) `git submodule init; git submodule sync; git submodule update`.