Added InteropDotNet support
Added additional unit tests and made all Interop related functionality internal.
Fixed regression introduced in last commit

Interop interfaces and Library loader must be public.
Merge branch 'feature/mono-support' into develop
Back ported setvariable fix from 3.03 to dev (Issues #120 and #68)
Backported multi-page tiff support from dev_3.03.
Changed trace source to "Tesseract" and updated change log.
Fixed getversion by just returning a constant for now.
Merge branch 'release/2.0.0'