Feanil/ansible deploy

Tasks that should be re-run when a new version of the code
is installed are now handlers that are notified once the code has
been checked out and the directory is ready(ownership change).

Put the configuration information in the vars for the nginx role
since that is the only role that uses it.

There is no need to re-run it after it has already been run
in common.

nginx logrotate fixup

* Set postrotate script to SIGHUP nginx after rotation
* Explicitly set permissions on freshly created logfiles

Added actions that would result in static assets for the cms and lms
to be generated after the edxapp has been checked out.

Providing a full path to the secure repository works just fine.

Based on jarv/continuous-integration.

Cloudformation Security Group and port forwarding updates.

  - Add SSL forwarding to the Loadbalancer.
  - Perform the health check against the server's heartbeat page.

feanil/pre requirements

removing the ec2_elb library, now in 1.2 core