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Make ptb_word_lm compatible with the latest TensorFlow source while maintaining backwards compatibility with TF 1.0

Remove code and append flag warning

Add case for compiling ops if tensorflow was compiled from source using gcc >= 5.0

2. Fixed accuracy when calcuting logs more than 10 steps

Fixes #1014

Without the new variable_scope, creating apply_gradient_op raises
an error that additional moving average or slot variables could not
be created. This is because of the 'leaky reuse' of variable scope,
so we correct the problem by explicitly introducing a new variable scope.

Related issues: tensorflow/models#901, tensorflow/tensorflow#6220

Remove the deprecated `scalar_summary` and use `summary.scalar` instead. 

The current program gets the following warning:
WARNING:tensorflow:
build_graph.: scalar_summary (from tensorflow.python.ops.logging_ops) is deprecated and will be removed after 2016-11-30.
Instructions for updating:
Please switch to tf.summary.scalar. Note that tf.summary.scalar uses the node name instead of the tag. This means that TensorFlow will automatically de-duplicate summary names based on the scope they are created in. Also, passing a tensor or list of tags to a scalar summary op is no longer supported.