Merge pull request #11 from DavidGinzberg/Check-Row

Add row validation
Merge pull request #12 from DavidGinzberg/gh-pages

Merge test content into master
Added accessor and validity tests

Added tests for accessors which have not yet been implemented. Also
added a test to confirm that puzzles which are not 9x9 will fail.
Merge pull request #13 from DavidGinzberg/Test

Added accessor and validity tests
Merge pull request #16 from DavidGinzberg/gh-pages

Added accessor and validity tests
Merge pull request #17 from DavidGinzberg/master

Fixing out-of-sync gh-pages branch