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Feature Updates
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* Added the HelcimToken model (AKA the "Token Vault") - allows saving of
Helcim Commerce card tokens to allow re-use in later transactions.
* Made functions for HelcimTransaction views more configurable - can
now choose exactly which features to enable and disable.
* Reworked settings to default to more conservative values. Thinks will
generally be disabled or redacted by default, but can be enabled as
needed.
* Added redaction settings for credit card CVV, credit card magnetic
strip data, and encrypted credit card magnetic strip data.
* Improved sandbox functioning to make setting up a new demo site
easier.
Bug Fixes
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* Fixed issues where the ``HELCIM_REDACT_ALL`` flag was not overriding
properly.
* Updated redaction functions to accommodate all known fields
containing cardholder information.
* Fixed issue where POST requests were returning byte-data rather than
string data.