Add Makefile

Make it easier to run tests.

.dockerignore

@@ -1,5 +1,6 @@
 .git
 .dockerignore
+circle.yml
+Makefile
 README.md
 test
-circle.yml

Makefile

@@ -0,0 +1,6 @@
+.SILENT :
+.PHONY : test
+
+test:
+	docker build -t jwilder/nginx-proxy:bats .
+	bats test

README.md

@@ -218,3 +218,13 @@ If you are using multiple hostnames for a single container (e.g. `VIRTUAL_HOST=e
 If you want most of your virtual hosts to use a default single `location` block configuration and then override on a few specific ones, add those settings to the `/etc/nginx/vhost.d/default_location` file. This file
 will be used on any virtual host which does not have a `/etc/nginx/vhost.d/{VIRTUAL_HOST}` file associated with it.
 
+### Contributing
+
+Before submitting pull requests or issues, please check github to make sure an existing issue or pull request is not already open.
+
+#### Running Tests Locally
+
+To run tests, you'll need to install [bats 0.4.0](https://github.com/sstephenson/bats).
+
+    make test
+