* Added examples for the following
* Update a class/object
* Patch a class/object
* Add a message to a class/object
* Expire an object
* Create a JWT with new classes/objects
* Create a JWT with existing classes/objects
* Fixed various minor formatting issues
* Made function/method names more general (ease of replication
across different languages)
* Added checks for class/object presence
* Clarified some docstrings and comments
* Create language-specific READMEs with setup and usage instructions
* Add links to each language-specific README from main README
* Converted examples to use importable classes and functions
* Added class- and function-level docstrings and type hinting for IDEs
* Removed use of WALLET_* environment variables (now function arguments)
* General formatting updates (line length, indentation, etc.)
* Switched Java, .NET, and PHP to use Walletobjects libraries
* Updated JWT examples to show creating a class and object at once
* Fixed error with missing status parameter for certain pass types
* Added batch creation example for raw HTTP requests
* Removed generator scripts (doesn't work with the Wallet libraries)
