Use OpenStruct.
Optimize colorization and improve whitespace highlighting.
Add inline word-diff highlighting.
Add runtime dependency on diff-lcs, although di can work without it.
Bump the version number to 0.4.0.
Update HISTORY.
Fix a bug that inline diff colorization fails to restore the color at EOL.
Invoke colorizer just once per process.
Enhance --color like Git.
Bump VERSION to 0.4.1.
Set better labels and disable pager when invoked from git difftool.