Update README.md

Remove "Strip EggBot Data" extension

functionality moved to "manual" tab of EggBot Control extension.

Revise pen up/down handling. Add explicit resolution setting

Hatch: Correct bug with nonzero gap length, add live preview.

Close #32

Bump version prior to packaging with Pyserial 2.5

Fix for MacOS 10.11.1 serial timeouts

Version bump for clarity (2.6.1

Version 2.6.0

* Update to pyserial 2.7.0. Closes #17.
* Add support for multiple motor resolutions. Closes #18.