Update README.md to support .NET 4 runtime
Support 'log' command 'range' option

Since TortoiseGit 1.8.1.0-162-g13c2b8c
LogDlg: Allow arbitrary gitrevision ranges from cli
Support 'revisiongraph' command

Since TortoiseGit 1.7.15.0-16-g4b998e7
Build Success after port TortoiseSVN RevisionGraph
Support 'clone' command 'exactpath' option

Since TortoiseGit 1.8.4.0-168-g3a06cce
Add command-line argument to tortoisegitproc that specifies value for Directory field