add support for constraints applied after sgd step
this includes a definition for an l2 constrained
as used in many recent papers
make the dropout mnist example use constraints
fix typo I spotted in regularizers
enable testing of constraints
adapt description in example to changed parameters
also add a readme for the MNIST examples
fix capitalization
fix random seed for conversion
remove leftover simd
change comment in mnist_dropout script to reflect the actual result it gets
Merge pull request #8 from stokasto/add_constraints

Add norm constraints