Semi-major update:
- Add support for user property operations (set, setOnce, add, unset). Please refer to the readme for more information.
- Add ability to go offline (disable sending logged events to server).
- Fix bug where event and identify queues are not truncated if eventMaxCount is less than eventRemoveBatchSize.
- Fix bug where fetching nil/null values from database causes crash.
- Add ability to set custom deviceId (warning: only use if you know what you are doing - see readme).