Added support for Lua 5.2+#2

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JorjBauer wants to merge 3 commits intobatrick:masterfrom

JorjBauer:master

Commits on Aug 24, 2015

updated for 5.2
Jorj Bauer
committed
added a rockspec for 1.2.2
Jorj Bauer
committed

Commits on Aug 25, 2015

simplification of upvalue value getting/setting
Jorj Bauer
committed