Improve IRC steps
Properly handle it when override URL is not filled in.

Also, update docs to drop a typo and reword.
support pull_request_review_comment event on irc service
support commit_comment event on irc service
oops
Trim spaces
Merge remote-tracking branch 'solanolabs/master'

Conflicts:
	lib/services/tddium.rb
Merge pull request #619 from camelmasa/trim-spaces

Trim spaces.
Merge pull request #618 from soh335/feature/irc_pull_request_review_comment

support pull_request_review_comment event on irc service
Merge pull request #615 from dideler/patch-1

Improve IRC steps
Merge pull request #617 from soh335/feature/irc_commit_comment

support commit_comment event on irc service
Update docs, fixes #548
Doc fixups fixes #571
present.ly is offline these days, fixes #600
forgot to nuke the test