added pako and b64gzip to bridge/vendor.
include compressed blockly source in JS output.
load existing blockly program from page src if it exists
indicate in widget whether bridge is connected to editor.
indicate when code changes have occurred in widget.
add 'allow others to remix my blockly code' checkbox.
replace github link in editor w/ instructions.
stop caching blockly source, it's too buggy.
better fault tolerance when saved workspace throws exceptions.