Release 2.18.0

[technicalpickles]

I wanted to do some smoke testing before a final release, but other ran out of time tonight.

Full Changelog

Implemented enhancements:

• Only coerce ids that are all digits into integers #1052 (technicalpickles)

Closed issues:

• Allow for non-integer user id in the shell adapter. #1117
• Markdown syntax in docs/adapters.md preventing update of hubot.github.com #1100
• Possible Error in Docs #1096
• Propose adding Hubot-Mattermost to list of Hubot adapters #1089
• bug(hubot@2.17.0): adapters don't run script #1086
• Depressing Pug Picture #1084
• Hubot - robot.http get method returns null body & res. Suspecting hubot timing out #1080
• Steam + Hubot #1076
• Hubot won't start on Heroku because of node modules #1071
• Documentation 404 #1064
• Can't make HTTP requests #1060
• Define and document testing patterns for scripts #985

Merged pull requests:

• Mattermost adapter #1120 (technicalpickles)
• Upgrade express to v3.21.2 #1119 (sgerrand)
• Fixed link to getting started #1116 (jackmawer)
• Fix http and https documentation #1114 (technicalpickles)
• [shell] don't color hubot responses green, to be more visible on light backgrounds #1111 ([technicalpickles](https://g
  ithub.com/technicalpickles))
• Determine adapterPath in robot.coffee, rather than bin/hubot #1109 ([technicalpickles](https://github.com/technicalpickl
  es))
• Updated copyright to 2016 #1103 (aqnouch)
• Update docs to reflect external scripts brain location #1101 (cycomachead)
• Added Twilio IP Messaging adapter to the list. #1099 (philnash)
• Add Skyweb to a list of adapters #1097 (EllisV)
• Instructions for deploying hubot to IBM Bluemix #1095 (kauffecup)
• Adding documentation for testing Hubot scripts #1094 (mdelagrange)
• Proxy instructions: typo + foolproof #1092 (jbick)
• Optionally use setImmediate instead of nextTick in middleware #1081 (bhuga)