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updated readme
Deleted non-finished test file
Updated badges
Fixed method default params value as empty string. Fixes #45

* Also fixed param definition on methods
Update GearmanClient.php

Fixed typo on line 436
GEARMAN_METHOD_ADDTASKNACKGROUND  ==>  GEARMAN_METHOD_ADDTASKBACKGROUND
Merge pull request #46 from nkornev/patch-1

Update GearmanClient.php
removed persona file
Merge branch 'master' into 2.3