Compiling and running the Qt unit tests wasn't convenient, because you'd have to 'make clean' if you were switching between compiling bitcoin-qt and bitcoin-qt_test, because they both compiled the same sources with different #defines into the build/ directory.
This pull makes the Qt unit test build directory build_test, so the two different builds don't interact with each other.
Automatic sanity-testing: PASSED, see http://jenkins.bluematt.me/pull-tester/923602f11d441435aabfa7772b2f2bc5869bb334 for binaries and test log. This test script verifies pulls every time they are updated. It, however, dies sometimes and fails to test properly. If you are waiting on a test, please check timestamps to verify that the test.log is moving at http://jenkins.bluematt.me/pull-tester/current/ Contact BlueMatt on freenode if something looks broken.