Added handing for perEnd

There was no handling for a PER to show the review period.
Added content to the template for this as per the process
document, and added checking and handling to ensure there IS
an end to the PER scheduled.
Addressed comments

Grammar change broke pubrules checker.
Extra console.log calls in tests removed.
Merge pull request #365 from w3c/p-perEnd

Added handling for perEnd