added _ as accepted character in oauth services.  Changed github-enterprise name to github_enterprise

Accessibility fixes

Fix #911 where emails not sent.

disable rendering media links/syntaxes inside literals

Spotify issue with 3 segment spotify URI

Meteor 1.2

Conflicts:
	.meteor/versions

Spotify enhancements to handle more syntaxes

Enhance Spotify transformer to handle syntax with 4 groups like `spotify:user:spotifydiscover:playlist:2RjlnjirDnFioPelxk0g4M`

Users model findOneByEmailAddress had a typo in the query field.  The
following use cases are fixed:
1. sendConfirmationEmail
2. sendForgotPasswordEmail
3. lookup existing admin by email when initializing RocketChat at
startup

Changed internal bot to only listen on public rooms

Ability to change bot name

Spotify integrations

Fix #911.  Set MAIL_URL variable after Meteor.startup