Fix: thumbnail not displaying for SDF, RDF, SMILES files. Added two new formats SDFV3 and RDFV3 that will refer to V3000 SDF and RDF files. SMI file is now a multimol file.
Fixes #22: The green dot is replaced with a version string either "V2" or "V3". The string is now displayed for all the MOL, RXN files.
Fixes #59: The green background text is replaced with a simple gray background text. A fix is also made in approximation algorithm.
Beta.3 changes
Added a new test project for ThumbFish project containing some basic tests. Made some changes to ThumbFishDocument class to make the tests pass.