use_bias=True by 2x by using nn.bias_add.
*   Update iOS examples to use CocoaPods, and moved to tensorflow/examples/ios.
*   Adds a family= attribute in `tf.summary` ops to allow controlling the tab
    name used in Tensorboard for organizing summaries.
*   When GPU is configured, do not require --config=cuda, instead, automatically
    build for GPU if this is requested in the configure script.