Add Lua 5.1/5.2 test suites

[dibyendumajumdar]

This issue will track progress for adding the test suites from Lua (http://www.lua.org/tests/) to this repository. Modifications will be made to the test suites where necessary to make them work with LuaJIT.

It maybe possible to backport additional tests from 5.2.x and 5.3.x series where the language & libraries are compatible.

I will do the work on a branch initially and once working will merge it to the master.

License: The Lua Test suites are under MIT license.

[dibyendumajumdar]

Imported and hacked the Lua 5.1 and 5.2.2 test suites so that they run successfully on Mac OSX El Capitan. To be verified on Linux and Windows.

[lukego]

Is this ready to merge? (Should I make the CI in #10 run this test suite?)