Upgrade breeze version to 0.12

breeze 0.12 has been released for more than half a year, and it brings lots of new features, performance improvement and bug fixes.
One of the biggest features is LBFGS-B which is an implementation of LBFGS with box constraints and much faster for some special case.
We would like to implement Huber loss function for LinearRegression (SPARK-3181) and it requires LBFGS-B as the optimization solver. So we should bump up the dependent breeze version to 0.12.

For more features, improvements and bug fixes of breeze 0.12, you can refer the following link:
https://groups.google.com/forum/#!topic/scala-breeze/nEeRi_DcY5c