Create separate projects for MatrixKit library and MatrixKit code sample

[SBiOSoftWhare]

It will allow to decouple sample code from MatrixKit code and use specific project configurations for each projects.
And it will be an opportunity to have a target named MatrixKit that will allow to use Swift code in Objective-C easily without renaming Product Module Name build setting of current MatrixKitSample target.
Indeed in order to use Swift code in Objective-C inside MatrixKit framework we need to import <ProductModuleName>-Swift.h in Objective-C implementation files (.m). As Product Module Name is currently MatrixKitSample in MatrixKit project and generated pod project has MatrixKit as Product Module Name it could not compile for both cases without renaming the Product Module Name.