Added --comment flag

Summary: Closes T9, Added --comment flag to logcommand so we can do gojira log -c "Fixed the stuffs" TASK-1234 2h 30m

Test Plan: Test the command with the new flag

Reviewers: gabe

Reviewed By: gabe

Maniphest Tasks: T9

Differential Revision: https://phab.thezombie.net/D3