DirectStorageDataSet contains instances in rows.
Fix test cases.
Fix examples.
Fix FANNFormatLoader.
Fix MNIST benchmark.
Fix CIFAR.
Fix python interface
Fix LibSVM dataset loading
Fix two spirals benchmark.
Update documentation of datasets.
Fix python test script.
Fix C++ example.
Fix Python example.
Simplify Python test script.
Merge pull request #71 from AlexanderFabisch/transpose-dataset

Transpose dataset
FANN dataset loader is now just a function.

In addition, we have a test case for it.
Merge pull request #74 from AlexanderFabisch/fann-loader

FANN dataset loader is now just a function.
Compute error and gradient at the same time.
Refactor logging in examples.
Clean up logging in CIFAR10 and MNIST.