Nicer, friendlier HipChat notification message

The current HipChat notification is, in a word, hideous.

This pull request:
  - separates the mashed-together blocks of text (spaces are our friends)
  - uses **bold** to help highlight and separate bits of the string
  - uses HipChat's HTML capability to make a link to the Errbit problem URL, rather than pasting the ugly long URL string in the body of the message
  - adds a counter for the number of occurrences of the issue