Added CSPBox class and basic tests.
Added CSPBoxStack class, its method constructTallestBoxStackFromArray.
Also, moved CSPBox to the CSPuzzles directory. Completed tests for the
entire set.
Palindromes: fixed bug at the very limits (as indices are unsigned, they
were sent to the other end.
Merge pull request #3 from diegum/puzzle/TallestBoxStack

Puzzle/tallest box stack