Structures that hash to the same value are sharing values.

I added a unit test "TestStructHashesEqual" that is currently failing, so
that someone can investigate.
[ObjectTranslator] Fixed #85 Structures that hash to the same value are sharing values.
 - Using objectBackMap only for non-ValueTypes.
Merge pull request #85 from MikeSchurman/master

Structures that hash to the same value are sharing values.
Update README.md
[KeraLua] Fixed Debug Hook callback (usingn a cdecl) trampoline #56
Fixed iOS tests build
Update iOS OSX Links
[build] Fixed https://github.com/NLua/NLua/issues/95 KopiLua directives was not defined.
[build] Better Android build.
[README] Update readme.
[submodules] Bumped submodules KeraLua, KopiLua
Update README.md
Fixed #68 "." in key causes error
- Now is possible to access keys with dots escaping '.' with '\' lua ["g_dot.key\\.with\\.dot"];
[NLua] Implemented operator + handling using metatable method __add.
- Missing tests
Updating Readme.md
Merge pull request #97 from gportela85/fix-readme

Updating Readme.md
* Merge fix.