HipChat Handler

Adds a handler that is capable of sending notices into HipChat, the team communication system provided by Atlassian.
This is based on the PushoverHandler and built on top of the socketHandler.

The needed configuration is described in the docblock of the HipChatHandler file.
Fixing bad docblock.
Merge pull request #193 from rdohms/hipchat-adapter

HipChat Handler