Add task and doc on deployment

After much trial and error, I was able to deploy to Elastic Beanstalk
(EB). Initially, I was running into an issue where when I deployed, EB
wasn't able to find the entry-point application, even if I used eb
configure to set the WSGIPath variable. The reason for this (I think) is
that even if you set WSGIPath to some.module.somewhere.app, EB still
needs to know what the name of the Flask app variable is. (The tutorial
has you make the entry-point application runnable, so I'm not sure why
it would need to know the name of the Flask app variable, but alas.)

The solution I arrived at was to create a Procfile that specifies the
module and the Flask app name.

For:
#8

README.md

@@ -16,3 +16,7 @@ For all other command line tasks, the affils project uses [Invoke](https://docs.
 5. Run the development server: `invoke dev` or `inv dev`.
 6. Read the `tasks.py` module for other command line tasks.
 7. Read the [standards document](./doc/standards.md).
+
+## Deployment
+
+Read the [doc](./doc/deploy.md) on deploying to production.

doc/deploy.md

@@ -0,0 +1,19 @@
+# Deploying affils
+
+The affils service is deployed to AWS's Elastic Beanstalk service. If
+you use your Stanford credentials to log in to AWS, choose the
+production profile, and set your region to Oregon (us-west-2), and then
+you navigate to the Elastic Beanstalk console, you should see an Elastic
+Beanstalk environment called `affils-env`. The `affils-env` environment
+contains the `affils` application. If you click the `affils`
+application, you should be able to view information about the affils
+service.
+
+To deploy the files from your computer, enter the following:
+
+```
+inv deploy
+```
+
+This command should upload the affils files from your computer to AWS's
+Elastic Beanstalk service.

tasks.py

@@ -62,3 +62,14 @@ def dev(c):
     Assumes you've activated the virtual environment.
     """
     c.run("cd src && flask run")
+
+
+@task
+def deploy(c):
+    """Deploy the affils service.
+
+    Assumes you have the Elastic Beanstalk CLI tool, eb. Also assumes
+    you have AWS configured properly. You should set Oregon (us-west-2)
+    as your AWS region, and you should have AWS production credentials.
+    """
+    c.run("eb deploy")