Corrected paths for docker container directories and scripts

Rename courses app to course_metadata

Rate limiting.

ECOM-3896

Requiring authentication for all API calls

ECOM-3895

Requiring authentication for all API calls

- All API calls require authentication
- Added support for OAuth2 authentication
- All API endpoints default to using Django model permissions

ECOM-3895

ECOM-3895

ECOM-3895

ECOM-3895

Updated production requirements

Added requirements monitoring file

ECOM-3801

Add client_credential flow to refresh management cmd

ECOM-3602

Update requirements to fix docker-compose version to 1.5.x

Loading private settings for devstack users

Removed Elasticsearch sniff_on_start

This functionality is broken on AWS.

Clarify Makefile target names for requirements.

`make requirements` is what most developers will run, so it should be
shorter and more memorable. The more verbose `make
production-requirements` is used for installing prod requirements.

add newrelic to requirements for prod

Added page to preview queries

ECOM-3261

Updated id and name analyzers

Using a lowercase keyword analyzer to better support wildcard queries.

Fixed bug related to whitespace stripping

 Stripping all whitespace breaks the queries being previewed. We can live with the extra bytes of whitespace going over the wire.

Added JWT Authentication

The API now supports authenticating users via JWT.

Updated install_es_indexes management command

We should be referencing aliases from our code, not indices. This change updates the management command to create an index with a unique name and assign it an alias. Documentation has been updated accordingly. Additionally, the code creating the alias/index has been moved to a class that is now shared with the tests to avoid code duplication and ensure tests are run under similar conditions (e.g. alias pointing to index) to production.