Automate project build

Adds a build.xml so that when a developer runs ``ant`` it will build the project.

Currently that does the following:

* lints the code
* runs PSR2 static analysis
* installs composer deps
* clears test cache
* runs phpunit tests

I would like to add more doctrine fixtures so that we can also import those when the project is built which would remove the need to import the .sql file. I think that will have to wait until I'm done writing tests though.