Add an option to override max tasks pre child for edxapp workers.

Update default tasks per child for high mem queue.

Ecommerce URL root

Delete symlinks that point to nothing.

add configuration for segment.io key

Don't need pycurl for apt_repository anymore.

Update to use the new fix for nonetypes.

configure segmentIO whitelist

We used to need to install python-pycurl so that the
apt_repository module would work correctly but the code
of that module has changed. It uses the apt python api
instead and installs it automatically if it is not available.

https://github.com/ansible/ansible-modules-core/blob/devel/packaging/os/apt_repository.py#L104-L118

Rationalize custom modules

Remove unused insights variable

Update to produce a file that is only one YAML document.

Include the sandbox vars on disk as well.

Removed post.txt from the list of files that will have its github urls replaced with git mirror urls.

Removed post.txt from the list of files that will have its github urls replaced with git mirror urls.

Add PayPal defaults to the ecommerce role

Fix travis.