Implement ADMIN-DIE commands

Added a function for each of the following commands:

ADMIN
AWAY
CNOTICE
CPRIVMSG
CONNECT
DIE

Wrote docstrings based on [RFC 2812](http://tools.ietf.org/html/rfc2812) and [Wikipedia](http://en.wikipedia.org/wiki/List_of_Internet_Relay_Chat_commands).

Accepting this pull request resolves #11.