Random.Mt19937ar: import from funlib and reconstruct as vital module
Random.Mt19937ar: add test for Random.Mt19937ar module
Random.Mt19937ar: add documentation
Random.Mt19937ar: embed data in a test code
Random.Mt19937: fix and improve an introduction and a note.
Merge pull request #214 from rhysd/add/mt19937ar

Imported Random.Mt19937ar from vim-funlib