Add ability to request any sided dice be rolled any number of times both
publicly and privately.

Added the ability for DMBuddyBot to respond to the command "Roll a xdx".
This command can also be /msg'd directly to DMBuddyBot
Add Character Creation

Added the ability to ask the DMBuddyBot to "Roll Honest Character 3d6".
Implemented a check for a 4d6 character as well, but method to roll a
4d6 variant character not yet implemented.