Define 2 configurations for Revit 2014

@sharadkjaiswal I have defined 2 more configurations for Revit 2014. let's take a look. Thanks.
So the output path will become bin\AnyCPU\Debug(Revit2014)\Revit_2014, can you change it to \bin\$(Platform)\Debug\$(REVIT_VERSION) and similarly for Release configuration.