Fix help section for warden snap
Fixed spelling of Oct in rmZFSSnapDate function
* rmZFSSnapDate: Fixed bug regarding single digit days. 'zfs get' outputs day one to nine as single digits which mess up the comparison with the given date from the user. Now we replace it with double digits before comparison.
* rmZFSSnapDate: Split sed command into multiple sed commands to make the code easier to read.
Removed debugging echo
Merge pull request #59 from bjar/warden

Warden snap removedate changes