User Story 11: As a user I should be able to read and solve a Sudoku game from a CSV file

Description:
Added parser for .csv files and unit tests

Signed-off-by: xaindeneb <xaindeneb@gmail.com>
Merge pull request #5 from pysudoku/csvparser

User Story 11: As a user I should be able to read and solve a Sudoku gam...