Add libjpeg-dev to edxlocal play

Because running the tests for thumbnail manipulation requires it
moving sites-enabled to /etc/nginx/sites-enabled
removing default config and restarting nginx
use var for enabled dir
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
Merge pull request #1735 from edx/jarv/nginx-links

moving sites-enabled to /etc/nginx/sites-enabled
Merge pull request #1655 from edx/edxlocal-libjpeg

Add libjpeg-dev to edxlocal play
defaulting common_hostname to empty string

also extra vars overrides developer sandbox defaults
Merge pull request #1743 from edx/jarv/fix-flag-release

defaulting common_hostname to empty string
Merge pull request #1744 from edx/release

Release
changing null defaults to empty strings to deal with ansible bug
change the repo for certificates and fix checkout
wip

bug fix

rename

Adding renamed

Adding key

typo

bad arg

Adding force yes

nuclear

comments, vars

ignore errors

fixing install check

ensuring started

moving tasks in, conditional inc not working

changing tac

missed one

typo

fixed conditional
added comment about package
Merge pull request #1745 from edx/jarv/xserver-null-values

changing null defaults to empty strings to deal with ansible bug
Merge pull request #1746 from edx/jarv/fix-cert-checkout

change the repo for certificates and fix checkout
adding helper scripts in /edx/bin

This adds some helper scripts for managing the edx server.
Merge pull request #1741 from edx/jarv/add-helper-scripts

adding helper scripts in /edx/bin