Add documentation on setting up server for testing
Add links (in comments) to two handy blog posts

I haven't gotten around to writing tests for Angular directives or
services yet, but when I do, I'm going to want those URLs handy as
reference material. Might as well save the links now.
Make "ant test" run Karma as well as PHP tests
Add E2E configuration for Karma, currently unused

No tests use this yet, but when we do write some end-to-end tests, we
can use this configuration to run them. Note that the configuration may
not work in its current form: depending on what Javascript files the
E2E test needs, the files list might need to be edited to add those
necessary files. The rest should work fine.