Merge pull request #6 from michaelavila/add_mit_license

Add MIT license
Update readme
update the perl test and Example code to match README
Merge pull request #7 from bistik/rna-transcription
add beer-song exercise
Merge pull request #8 from bistik/beer-song
add point-mutations exercise
Add phone-number exercise
Merge pull request #9 from bistik/point-mutations

point-mutations
Merge pull request #10 from bistik/phone-number

phone-number
Add proverb exercise
Merge pull request #11 bistik/proverb
Add pascals-triangle
Merge pull request #12 bistik/pascals-triangle
Add accumulate exercise
Merge pull request #13 from bistik/accumulate
Add atbash-cipher exercise
Merge pull request #14 from bistik/atbash-cipher
Add grains exercise
Merge pull request #15 bistik/grains