fix documentation - manage_service -> service_manage
add parameter to set a log file
only check the log file if it is actually used.
Merge pull request #152 from apenney/tighten-dependencies

Tighten the dependency to > 4.0 for stdlib.
Merge pull request #117 from CpuID/master

fix documentation - manage_service -> service_manage
Merge pull request #122 from darix/add_log_file_param

add parameter to set a log file
Merge branch 'master' into 3.1.x
Fix restrict_spec test
Merge pull request #159 from cyberious/3.1.x

merge Master back up to 3.1.x