Remove binary_sha1 and binary_url definitions from Package

This is now "guessed" by Autoparts and is obtained from the Autoparts
storage repository. This will make the binary installation/contribution
process decoupled from Autoparts and will hopefully drive more
contributions.
Remove binary_url and binary_sha1 from all packages
Fix errant source_url for MySQL
Fix errant condition while checking for source_install
Call a webhook when a package is installed or uninstalled.

This is needed to update the web IDE.
If web hook call raises an error, fail silently.

Allows the command to exit without an error status.