added functionality for the Thorlabs Liquid Crystal Controller
added qubitekk cc
added support for the thorlabs shutter controller
fixed SC10 controller
cleaning up based on suggestions in pull request

added IntEnum class for mode
added license
changed communication protocol to be SCPI compliant
fixed file headers, added count enable command

File headers were fixed to have the right file name.
Assume_units was added to the dwell time and window in the cc1 file
the cc1 was changed to add the count enable function
the qubitekk cc example was changed to reflect this change
added overflow handling to example, fixed typo
Merge pull request #34 from CatherineH/dev

Added support for the Thorlabs LCD and shutter controllers, and the Qubitekk Coincidence Counter