fixes #27
Add support for Cli_ReadMultiVars and an example
merge
added PLC Stop command
Add test for  read_multi_vars
plc start added
Merge pull request #32 from mateuszk87/master

added PLC Stop command
Merge pull request #31 from spreeker/master

should fix issue #29
tests for stop, cold_start hot_start PLC in client
start fake server from within test suite
preserve env
use systemwide nosetests
Merge pull request #28 from lance5107B/master

Add support for Cli_ReadMultiVars
Update __init__.py
Merge branch 'master' of https://github.com/gijzelaerr/python-snap7