* Small typo fixes
'10-dimensional' to '100-dimensional'
'functional correctness with 200' to 'functional correctness with 300'
* Create CNTK_206B_DCGAN.ipynb
'10-dimensional' to '100-dimensional'
Use momentum variable
* Add MinibatchSourceConfig struct that makes construction of a reader
a little more straight-forward (esp. on the c++ side)
* Refactor python implementation of MinibatchSource.
* Add support for specifying the maximum number of sweeps over the input
dataset when instating a minibatch source.