message: Make default avatars clickable
  BaseAvatar can be passed an onClick which is called when it's, er,
  clicked, except when it was the default avatar in which case it
  merrily ignored it. Make it not ignore it.
diff: @@ -145,6 +145,21 @@ module.exports = React.createClass({
  if (imageUrl === this.state.defaultImageUrl) {
  const initialLetter = this._getInitialLetter(name);
  + if (onClick != null) {
  + return (
  + <AccessibleButton element='span' className="mx_BaseAvatar"
  + onClick={onClick} {...otherProps}
  + >
  + <EmojiText className="mx_BaseAvatar_initial" aria-hidden="true"
  + style={{ fontSize: (width * 0.65) + "px",
  + width: width + "px",
  + lineHeight: height + "px" }}>{initialLetter}</EmojiText>
  + <img className="mx_BaseAvatar_image" src={imageUrl}
  + alt="" title={title} onError={this.onError}
  + width={width} height={height} />
  + </AccessibleButton>
  + );
  + } else {
  return (
  <span className="mx_BaseAvatar" {...otherProps}>
  <EmojiText className="mx_BaseAvatar_initial" aria-hidden="true"
  @@ -157,6 +172,7 @@ module.exports = React.createClass({
  </span>
  );
  }
  + }
  if (onClick != null) {
  return (
  <AccessibleButton className="mx_BaseAvatar mx_BaseAvatar_image"
  