v_50: Fix fallback to registry in GetMachineCode for Windows

This update affects Windows users who are using GetMachineCode method. This update fixes the fallback code that uses the UUID obtained from the registry that is used to generate the machine code.

v_49: Add User class for user authentication

Please read more in https://help.cryptolens.io/examples/user-verification.

v_48: Add HasNotExpired and Fix machine code method on Windows

1. Added a new method to check if a license has expired locally.
2. Fixed GetMachineCode method so that it falls back on MachineGUID when WMIC does not work (Windows only).
3. Update setup.py that could solve issues installing the library in newer versions of Python and other platforms.

#69 #71

v_47: Add missing "name" parameter in IncrementIntValue and DecrementIntValue methods

The missing name parameter was added to Data.increment_int_value_to_key and Data.decrement_int_value_to_key methods. This would allow you locate a data object based on its name instead of using the Id (object_id in Python).

v_46: Add more return fields to GetKeys method

The fields added include "pageCount", "total" and "returned". These are accessible via the third list item of the result.

v_45: Add GetCustomerLicenses and GetCustomerLicensesBySecret

Adding methods to retrieve customer licenses.

Please check out the following article on how to use the second method: https://help.cryptolens.io/web-interface/customer-secret

v_44: Add "AddFeature" and "RemoveFeature" methods in Key class

This update introduces two new methods, "AddFeature" and "RemoveFeature", that allow you to change the state of the 8 built in feature flags.

v_43: Add new API methods to the Key class

In this release, MachineLockLimit, ChangeNotes, ChangeReseller and CreateKeyFromTemplate were added to the Key class.

v_42: Add metadata property in Key.Activate

In this release, we added support for the metadata field that can be returned by Key.Activate. When metadata=true in the Key.Activate call, it will return an array of three elements instead of two, where the third element is the value of the additional metadata for a specific license.

v_41: Add an error if period exceeds the limit

This release adds a new error message to Key.activate that will be thrown if the period exceeds the permitted limit in Python. The problem is described in https://github.com/Cryptolens/cryptolens-python/tree/master#the-expiration-date-cannot-be-converted-to-a-datetime-object-please-try-setting-the-period-to-a-lower-value, but in essence, the issue is that the timestamp representation of the expiration date causes an overflow in Python, and thus an error is thrown.