Merge pull request #576 from edx/e0d/ntp_in_common

Adding NTP to common to keep time sane.
Merge pull request #567 from edx/feanil/correct_cfn

Correctly reference instance type in server names.
Fixed email default var for edxapp
Removed deprecated Pearson variables
Merge pull request #577 from edx/will/fix-edxapp-defaults

Clean up edxapp defaults
Add a way to update legacy ora configuration.
Run the updates serially.
Add tests for vars we're going to use.
Restart if either file changes.
Merge pull request #579 from edx/feanil/legacy_ora

Add a way to update legacy ora configuration.
Copy instead of file.
Update config repo in devstack before running plays
Merge pull request #580 from edx/will/fix-devstack-release-update

Update config repo in devstack before running plays
adding EDXAPP_SITE_NAME to vars for provisioning
Merge pull request #583 from edx/jarv/fix-site-name

adding EDXAPP_SITE_NAME to vars for provisioning
Create log directories after rsyslog is installed

Those directories are created with 'syslog' as owner, if rsyslog is not
installed yet, the user does not exist.
Merge pull request #584 from tusbar/syslog-user-doesnt-exist

Create log directories after rsyslog is installed
Add curl to rbenv’s debian packages

rbenv install requires curl or wget, if none of them is installed, the
role fails.
Merge pull request #585 from tusbar/rbenv-install-requires-curl

Add curl to rbenv’s debian packages
Merge remote-tracking branch 'origin/master' into rc/empanada
Adds ability to have multiple named access logs be rotated