Additional edits to improve readability and removed the bit about PIL.

Apart from making minor edits on phrases, additional links were
provided to help the end user find resourced relating to this project.
Also removed line dealing with PIL. PIL is no long used in tomber.
Informing the reader that PIL is no longer used is no longer required.
A minor edit.
Merge pull request #4 from JoelMon/fix-minor-README

Additional edits to improve readability and removed the bit about PIL