Working spec tests!

- Tests basic creation of labels and clearing.
- Tests a jump and 2 consecutive jumps.
:lipstick: Cleanup.

- Rearranging order of methods.
Backspace / reset feature with spec test.
Echoing of first character entered in status bar.

- Closes #18.
- Closes #17.
Adds click and scroll tests.

- :lipstick: Cleanup - Moves clear tests together.
- Closes #12.
Adds status bar and reset tests.
Updating CHANGELOG.md.
Updating README.md.

- Adds backspace key info.