Lots of little fixes and updates:
- Removed all references to Apache HTTPClient to support Android M.
- Handle exceptions when fetching last known location from LocationManager.
- Add ability to set custom deviceId (warning: only use if you know what you are doing - see readme).
- Handle exception when cloning JSON object.
- Maintain only one instance of OKHttpClient.
- Add AmplitudeLog helper class that supports enabling and disabling of logging as well as setting of the log level.
- Fix bug where event and identify queues are not truncated if eventMaxCount is less than eventRemoveBatchSize.