Add a more NPM-friendly way to grab Soy files.

Hello @dpup, 

Please review the following commits I made in branch 'nick-soyfiles'.

ac7bc6a4e3de522764611cb6145390553b977cea (2013-04-16 20:32:05 -0400)
Add a more NPM-friendly way to grab Soy files.

R=@dpup