Python2 fix in Cryptolens#11

Add deactivate

Create trial key (Cryptolens#10)

* Start on CreateTrialKey

* Update input parameters

* Update docs

* Update setup.py

Fix error handling and update version number

Update version to the tar file

Add GetMachineCode method (Cryptolens#5)

* Add GetMachineCode method

* Add IsOnRightMachine method

* Update package info

* Update docs

Add support for saving and loading licenses as a string (Cryptolens#4)

* Add support for saving and loading licenses as a string

* Update examples

Update setup.py

Create a PyPI compatible package (Cryptolens#3)