huge improvements to backprop
Merge pull request #4 from linkerlin/master

fixed comments
updated
fixed constructor issues with reflection as well as an issue in backprop where the bias gradient might not match the length of the logistic layer
added backprop responding to number of epochs passed in
removed a few unused variables
fixed "Java heap space" problem
fixed "Java heap space" problem
Merge branch 'master' of github.com:linkerlin/java-deeplearning