tell.py: Clarify on an ambiguous message, and remove a little bit of redundancy in a regular expression.

The message that was sent implied that the user would receive the message
  instantaniously, which is not the case, as they only get the message
  the moment they speak.

The regular expression matched A-Z when the string was lowercase.
Merge pull request #283 from Zarthus/tell-clarify

tell.py: Clarify on an ambiguous message, and remove a little bit of redundancy in a regular expression.
Add cookie plugin
Make the header look better to my liking
Add Oreo cookies; Suggested by @DukePyrolator
Fix typo reported by @Zarthus
Merge pull request #285 from TheTechman/develop+cookie

Add cookie plugin
Merge branch 'develop'

Conflicts:
	plugins/tell.py