Move t/MediaWords/Test/ to lib/MediaWords/Test/ because a) "./lib" is the default library search location, and b) tests under "lib/.../t/" might want to use those test libraries too
Revert disconnecting-connecting to database (introduced in commit 330f49b896a0b59a733a4e2d495adc279b3468bb) because it's not clear why we're doing that, it breaks the unit test, and connect_to_db() connects to *production* database by default