Bumped version number to 0.3.0. This is deemed an alpha version.
Implemented stopwatch, used for recording how long a test takes.
Removed Transcript (0.1.0).
visitGroup renamed to enterGroup
Converted reporters to be delegates of runners, rather than visitors themselves.
INLRunner notifies its delegate accordingly.
Updated hijacker to use reporter as runner's delegate.
Don't use state descriptions, use the test's label.
Don't use group's description, use group's label.
Reporter uses node labels rather than descriptions.