Change hamming test to throw an exception for different strand lengths

Now throws an IllegalArgumentException if the strands are different
lengths.

merge

Added exercise accumulate

Added exercise atbash-cipher

The other track problems follow this convention as well.

Added scrabble-score exercise

Moved Gigasecond solution code from main file to example file (closes #29)

Added triangle exercise (see #3)

Added exercise gigasecond (see #3)

Added exercise space-age (see #3)

Added 'say' exercise as foregone (see #3)

Fetch appropriate configlet binary

Fixes incorrect check for 32 bit architecture.

The contents of this file will be included in each of the README.md
files that are delivered along with the test suites in the exercism
problems.

It's probably useful to provide a generic description of how to run
the tests, as well as a link to the language-specific help page or
useful documentation.