Added project files for Cipher challenge.
Added implementation of Caesar cipher and started doing some unit tests.
Added more unit tests.
Removed the wrap-around checks in the encrypt and decrypt functions as I want to support numbers and variable-case and those checks mess it up.
Added more unit tests for non-alphanumeric chars.
Space is ignored now.
Merge pull request #5 from TimCollins/3-Easy-Cipher

3 easy cipher