Update README and move the source file to go-mpi/MPI folder.#1

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andrewlee302 wants to merge 3 commits intoyoo:masterfrom

andrewlee302:master

Commits on May 6, 2015

Fix a error and update compiling details for convenient usages. Move the source file to a folder named "MPI" respected to go package naming style.
andrewlee302
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Commits on May 24, 2015