Updates to jsduck setup and comments

* Document all code
* Update files as appropriate to eliminate jsduck warnings
* Remove or move text that should not appear in generated documentation
* Don't use /* */ for multi-line comments (except documentation blocks)
* Update comments to reflect that this version of Guiders is a fork.

Change-Id: Ifbbf7bf5579f7c9f97487505ee2cac80df672226
Merge "Updates to jsduck setup and comments"