Edits for clarification.
Edits suggested by @lamblin.
Edits for clarification.
Additional minor edits.
Merge pull request #45 from mspandit/mlp-edits

Edits to MLP tutorial for clarification.
Edits suggested by @lamblin.
Merge pull request #46 from mspandit/conv-mlp-edits

Edits to convolutional multilayer perceptron tutorial, for clarity and grammar.