fixed --use usage with a = sign
updated documentation for headless mode
fixed exit_status for some situations where it produces wrong values.
updated changelog and buildfiles
updated doc
Merge branch '0.41' into 0.42
added exit hook to cli class
added named parameters to append_if_no_such_line - first part for #143
Merge branch '0.42' of github.com:krimdomu/Rex into 0.42
add possibility to write script templates for functions for faster execution
renamed internal variable
use exporter to export helper function
added script for append_if_no_such_line from #143 - liedekef
updated manifest
use 'perl' not $^X
added possibility to set executor for upload_and_run
added get_executor_for to upload_and_run function