Merge pull request lorin#4 from JamesBarwell/task_always_run

Add always_run task parameter

Author: lorin

README.rst

@@ -145,6 +145,7 @@ until               Boolean, task will retry until evaluates true or until ``ret
 retries             Used with "until", number of times to retry. Default: ``3``
 delay               Used with "until", seconds to wait between retries. Default: ``10``
 run_once            If true, runs task on only one of the hosts
+always_run          If true, runs task even when in --check mode
 ==================  =========================================================================================
 
 Complex args