get rid of failing issuer frame test. we can rez it later if needed.
Got rid of acceptance-test/local-config.js.sample, revised its README.

Now everything is configurable through environment variables, with
sensible defaults.
fixed SELENIUM_APP_URL default.
migrated acceptance test from selenium RC to webdriver/selenium 2.
prepare test db before running acceptance tests.
converted acceptance-test/run-tests.js to use tap.
added acceptance-test-utils.js tests and a bit of documentation.
Acceptance tests now end in .atest.js.

They're different enough from normal tap tests that I don't think they
should have the .test.js extension, but I would like to maintain that
naming style, so .atest.js seemed reasonable.

Also imported the acceptance test function as 'acceptanceTest' instead
of 'test' in login.atest.js, to make sure they don't get confused with
standard tap tests.
added docs for sauce labs.
Merge pull request #848 from toolness/saucelabs-integration

Migration of acceptance test from Selenium RC to Webdriver, Saucelabs integration