Google Code-in

As reported in Music Blocks Issue #1928, the console log output in Music Blocks is a mess. Much of what is reported is unnecessary and redundant.

This task is to:

1. remove gratuitous/redundant console.log statements
2. convert most of the rest of the console.log statements to console.debug statements (the exception being, we should continue to report the notes played to console.log and display the blocks being loaded.)
3. As per the suggestion in the issue, highlight the "Music Blocks is a collection..." preamble.