Added Rot-13
Added Rot-13 to Readme
Merge pull request #14 from simon-morris/master

Rot-13
Added N queens problem
Merge pull request #15 from adwhit/master

Added N queens problem
Added N-queens to readme
Added anagrams
Changes suggested in IRC
Updated readme
Merge pull request #16 from simon-morris/master

Anagrams
Added gray codes
Updated Readme
Merge pull request #17 from simon-morris/master

Gray codes