This reverts commit a25a85b9.

This commit includes:

 * Projects can have zero or more WebHooks.
 * The PostReceive job will ask a project to execute any web hooks defined for that project.
 * WebHook has a URL, we post Github-compatible JSON to that URL.
 * Failure to execute a WebHook will be silently ignored.

See http://about.travis-ci.org/docs/user/languages/ruby/ (the "Exclude non-essential gems like ruby-debug" section) for reasoning.

Switch to the https protocol in the Gemfile & Gemfile.lock since the
git protocol is sometimes blocked by firewalls (and is not easily proxied)

from running after every other rake command.

from running after every other rake command.

This reverts commit 0aa5682f8e3d2f50443fa8ac457daf5c9784dfd8.