Add libjpeg-dev to edxlocal play

Because running the tests for thumbnail manipulation requires it
Convert xqueue gunicorn configuration to file
Convert xserver gunicorn to configuration file
Convert ora gunicorn to configuration file
Convert edxapp gunicorn to configuration file
Convert analytics-api gunicorn configuration to file
Add changelog mention of gunicorn configuration file change
Add important =, dry out.
fix var name.
accidental commit
Pass the setting to edxapp env config.
Merge pull request #1734 from edx/feanil/deprecate_components_setting

Pass the setting to edxapp env config.
moving sites-enabled to /etc/nginx/sites-enabled
Merge pull request #1733 from edx/e0d/fix-change-enrollment

Add important =, dry out.
removing default config and restarting nginx
use var for enabled dir
Merge pull request #1717 from mitodl/cg/gunicorn_conf_files

Convert active gunicorn services to use configuration file
When overrides are set they are set by service variant name.
Merge pull request #1739 from edx/feanil/unbreak_edxapp

When overrides are set they are set by service variant name.
whitespace