Fix typos in readme
Connection: Fix type in `post()`; Improve;

@toto: Check update: Passsing IP clients address in header to fix Geographical Location reports appears not to be implemented by Google.
Update Hit

* Fix typo in `system_info` group name
* Move user agent and microtime setters from `__construct()`
* Set remote IP Address
* Build now generates Queue Time offset (useful for batch processing)