Merge pull request #51 from ccgn/master

Implement immutable and mutable pixel iterators.
Merge pull request #52 from ccgn/master

Update example
Merge pull request #53 from ccgn/master

Add an example Demonstrating generating fractals
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
fix conflict