Expands HIT unit test for broken external question.
Allows tests to call tp-make without triggering an uploading, speeding up some tests.
Fewer warnings when running tests.

All tests now `require 'minitest/autorun'` directly rather than
through Typingpool::Test. This eliminates warnings when running tests
via rake.

All tests now modify the $LOAD_PATH via a clearer and less error prone
line which uses __FILE__ instead of $0 and which references $LOAD_PATH
instead of $:.
Speeds up integration tests.

Instead of re-merging and re-splitting mp3 files over and over with
calls to tp-make, integration tests often now simply copy over a
ready-made project folder, which is generated at the start of the test
run and then deleted at the very end.

Adds a unit test to test this element of the test class.