Parameterise extract_hfm_interop_dlls.bat
Added HFM 11.1.2.2.300 libs
Add support for 11.1.2.2.300 patch set

This includes a breaking API change to the CreateStarSchemaExtDim method.
Credit goes to Keith Kitka for finding the bug and fix.
Fix build.bat for latest version
Add CONTRIBUTING guidelines document
Add instructions for building from source