Remove comments from suku
add algorithm and tests for naked pair detection
Update the readme with project goals
Remove Puzzle from board
Add new data for Sudoku
Refactor tests to pass for Board and Puzzle need to add back blanks and allowed methods
Readd allowed and blanks methods from 0.0.3
Remove pending from tests from allowed and blanks methods
Fix typo in logical_spec to pass test
Bump version number to reflect interface change to 0.2.0
Refactor cucumbers to pass