message: Fixes textStyle for Tab(heading)
diff: @@ -67,7 +67,7 @@ const DefaultTabBar = createReactClass({
  ? activeTextColor
  : inactiveTextColor;
  const fontWeight = isTabActive ? 'bold' : 'normal';
  - const isDisabled = disabled == undefined ? false : true;
  + const isDisabled = disabled != undefined;
  if (typeof name === 'string') {
  return (
  @@ -84,8 +84,8 @@ const DefaultTabBar = createReactClass({
  <Text
  style={[
  { fontSize: tabFontSize },
  - isTabActive ? activeTextStyle : textStyle,
  - { color: textColor }
  + { color: textColor },
  + isTabActive ? activeTextStyle : textStyle
  ]}
  >
  {name}
  