message: Remove disambiguation from user mentions, add tooltip for mxid
  Also add a tooltip for room pills = room alias/ID
  Requires:
diff: @@ -78,7 +78,7 @@ export default React.createClass({
  new RoomMember(null, resource);
  if (member) {
  userId = member.userId;
  - linkText = member.name;
  + linkText = member.rawDisplayName;
  avatar = <MemberAvatar member={member} width={16} height={16}/>;
  }
  } else if (isRoomPill) {
  @@ -101,11 +101,11 @@ export default React.createClass({
  if ((isUserPill || isRoomPill) && avatar) {
  return this.props.inMessage ?
  - <a className={classes} href={this.props.url}>
  + <a className={classes} href={this.props.url} title={resource}>
  {avatar}
  {linkText}
  </a> :
  - <span className={classes}>
  + <span className={classes} title={resource}>
  {avatar}
  {linkText}
  </span>;
  