Mocha.jl version update to v0.0.2

[Change Log](https://github.com/pluskid/Mocha.jl/blob/master/NEWS.md) for [Mocha.jl](https://github.com/pluskid/Mocha.jl) v0.0.2:

## v0.0.2 2014.11.20

* Infrastructure
  * Ability to import caffe trained model
  * Properly release all the allocated resources upon backend shutdown
* Network
  * Sigmoid activation function
  * Power, Split, Element-wise layers
  * Local Response Normalization layer
  * Channel Pooling layer
  * Dropout Layer
* Documentation
  * Complete MNIST demo
  * Complete CIFAR-10 demo
  * Major part of User's Guide