Added `is_identified` function.

Added function to check if a user has identified for their nick.
Added Nick Verification.

Hanyuu will verify that the user has identified for their nick before sending the authcode.
Fixed errors.
Merge pull request #67 from Indysama/upgrade1.3/ircbot

See issue #69
Merge pull request #76 from R-a-dio/upgrade1.3/ircbot

Upgrade1.3/ircbot