Add Mersenne Twister to README.

README.md

@@ -26,6 +26,7 @@ For a more in-depth discussion of the rationale and advantages of Julia over oth
 - **[gcc, g++, gfortran][gcc]** — compiling and linking C, C++ and Fortran code.
 - **[curl][]** — to automatically download external libraries:
  - **[fdlibm][]** — a portable implementation of much of the system-dependent libm math library's functionality.
+ - **[MT][]** - Mersenne Twister is a fast pseudorandom number generator
  - **[OpenBLAS][]** — a fast, open, and maintained [basic linear algebar subprograms (BLAS)](http:https://en.wikipedia.org/wiki/Basic_Linear_Algebra_Subprograms) library, based on [Kazushige Goto's](http:https://en.wikipedia.org/wiki/Kazushige_Goto) famous [GotoBLAS](http:https://www.tacc.utexas.edu/tacc-projects/gotoblas2/).
  - **[LAPACK][]** — library of linear algebra routines for solving systems of simultaneous linear equations, least-squares solutions of linear systems of equations, eigenvalue problems, and singular value problems.
  - **[ARPACK][]** — a collection of subroutines designed to solve large, sparse eigenvalue problems.
@@ -38,6 +39,7 @@ For a more in-depth discussion of the rationale and advantages of Julia over oth
 [gcc]: http:https://gcc.gnu.org/
 [curl]: http:https://curl.haxx.se/
 [fdlibm]: http:https://www.netlib.org/fdlibm/readme
+[MT]: http:https://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
 [OpenBLAS]: https://github.com/xianyi/OpenBLAS#readme
 [LAPACK]: http:https://www.netlib.org/lapack/
 [ARPACK]: http:https://www.caam.rice.edu/software/ARPACK/

external/random/.gitignore

@@ -0,0 +1,3 @@
+/dsfmt-*
+/mt19937-64*
+/libMT*