#1 Compares text files, binary files, and directories

[Pankaj]

* While comparing the directories:
- Shouldn't go deep inside the directories if their
contents match or not. It should just see, if
corresponding directories are present or not.

* Should be able to compare both binary and text files

* Should be able to mark the differences with
different colors. Differences in terms of:
- addition/deletion of corresponding lines
- addition/deletion/modification of words between lines