Added button click for activiting web audio api on iOS
Fix gulpfile shell to require shelljs
Merge pull request #1 from tochiai/master

Fix gulpfile shell to require shelljs
Merge pull request #2 from onetruebob/master

Added button click for activiting web audio api on iOS
Included extensive comments on library code.
Merge pull request #3 from villanuevawill/master

Included extensive comments on library code.
updated .gitignore