ISSUE-21 - Fixed issue with authentication not working for write oper…

…ations

Added support for 0.9.4; added getlastQuery; added database if not ex…

…ists support

Added support for 0.9.3rc2

Added admin functionality; allowed user credentials in guzzle driver

First stable release

Added precision; added database exists method

Merged leaseweb/influxdb-php into influxdb/influxdb-php