tell.coffee: Use current recipient name

Address the recipient by his current username when delivering messages. As prefix matching is applied to recipients' names, it is  insufficient to address the user by the prefix, as their client most likely will not issue a highlight this way.
Changed the way the envelope.user is build so it won't clash with hubot-irc
Add a couple more deal with it gifs
Update mention regex to match @org/team correctly
jira-issues.coffee: fix typo in comments referring to HUBOT_JIRA_ISSUES_IGNORE_USERS
Add airplay support to spot
Merge pull request #1177 from minton/airplay

Add airplay support to spot
Added missing quote in Dependencies
Merge pull request #1181 from Rudikza/patch-1

Added missing quote in Dependencies
Filter out mentions with more than one forward slash
Fix 'sendgrid today' api call
Merge pull request #1185 from DazWorrall/master

Fix 'sendgrid today' api call
Support whats|what is|what's
Merge pull request #1172 from coyled/jira-issues-env-typo

jira-issues.coffee: fix typo in comments referring to ignore list
Merge pull request #1161 from pascaldevink/master

Changed the way the envelope.user is build so it won't clash with hubot-irc
Merge pull request #1165 from keithamus/patch-1

Add a couple more deal with it gifs
youtube-info.coffee: Add missing - and _ to short URL match
Merge pull request #1187 from driverdan/master

Add missing - and _ to short YouTube URL match
Merge pull request #1171 from spajus/patch-1

GitHub Pull request notifier: Update mention regex
Merge pull request #1186 from wadewilliams/patch-1

Support whats|what is|what's