Math: Add OpenBLAS, Add Armadillo GitHub repo link

Author: myd7349

README.md

@@ -432,7 +432,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 ## Math
 
 * [Apophenia](https://github.com/b-k/apophenia) - A C library for statistical and scientific computing [GPL2]
-* [Armadillo](http://arma.sourceforge.net/) - A high quality C++ linear algebra library, aiming towards a good balance between speed and ease of use. The syntax (API) is deliberately similar to Matlab. [MPL2]
+* [Armadillo](https://github.com/conradsnicta/armadillo-code/) - A high quality linear algebra library (matrix maths) for the C++ language, aiming towards a good balance between speed and ease of use. The syntax (API) is deliberately similar to Matlab. [MPL2] [website](http://arma.sourceforge.net/)
 * [blaze](https://bitbucket.org/blaze-lib/blaze) - high-performance C++ math library for dense and sparse arithmetic. [BSD]
 * [Boost.Multiprecision](http://www.boost.org/doc/libs/master/libs/multiprecision/doc/html/index.html) - provides higher-range/precision integer, rational and floating-point types in C++, header-only or with GMP/MPFR/LibTomMath backends. [Boost]
 * [ceres-solver](http://ceres-solver.org/) - C++ library for modeling and solving large complicated nonlinear least squares problems from google. [BSD]
@@ -448,6 +448,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 * [NT2](https://github.com/Mathieu-/nt2) - A SIMD-optimized numerical template library that provides an interface with MATLAB-like syntax. [Boost]
 * [LibTomMath](https://github.com/libtom/libtommath) - A free open source portable number theoretic multiple-precision integer library written entirely in C. [PublicDomain & WTFPL] [website](http://www.libtom.net/)
 * [linmath.h](https://github.com/datenwolf/linmath.h) - A lean linear math library, aimed at graphics programming. [WTFPL]
+* [OpenBLAS](https://github.com/xianyi/OpenBLAS) - An optimized BLAS library based on GotoBLAS2 1.13 BSD version. [BSD 3-clause] [website](http://www.openblas.net/)
 * [QuantLib](https://github.com/lballabio/quantlib) - A free/open-source library for quantitative finance. [Modified BSD] [website](http://quantlib.org/)
 * [Vc](https://github.com/VcDevel/Vc) - SIMD Vector Classes for C++. [BSD]
 * [Versor](http://versor.mat.ucsb.edu/) - A (fast) Generic C++ library for Geometric Algebras, including Euclidean, Projective, Conformal, Spacetime (etc).