Merge pull request #16 from dairiki/master

Fix for python 2.6 — use subprocess.check_call instead of .check_output
Updated changelog
Updated version
Fix for multiline option values

Need to split by \n otherwise values like command with args will be split by space too.
Merge pull request #18 from wiseteck/master

Fix for multiline option values
Using str.splitlines() which is more appropiate than str.split('\n')
Updated README.rst
Forgot to increase the version
Add 'md5sum' option for the paranoid