[mlpack] [mlpack/mlpack] Modify Softmax regression to have numClasses - 1 weights (#820)

[Ryan Curtin]

Just for the sake of annotation, the issue here is that this breaks the softmax regression tests for some reason:

```
$ bin/mlpack_test -t SoftmaxRegressionTest
Running 2 test cases...
/home/ryan/src/mlpack-sumedh/src/mlpack/tests/softmax_regression_test.cpp(252): fatal error in "SoftmaxRegressionTwoClasses": difference{40.8%} between acc{59.200000000000003} and 100.0{100} exceeds 0.5%

*** 1 failure detected in test suite "mlpackTest"
```

If we can resolve that problem this is a nice improvement for the softmax regression implementation.

I haven't had a chance to really dig in to what is wrong here yet, just to reproduce the problem.

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