Merge pull request spotx#2 from spotx/fix_target_public_exports

Fix target glua PRIVATE => PUBLIC export for add_subdirectory() includes

Merge pull request kevin-logan#6 from kevin-logan/msvc_compat

Msvc compat and const reference fix

Stack position (kevin-logan#4)

* glua :: added StackPosition to simplify glua stack manipulation

* glua :: added StackPosition to simplify glua stack manipulation

* glua :: fixed comments for stack position pull request

glua :: stack manipulation and tables (spotx#3)

* glua :: added support for manually traversing stack elements like lua tables

* glua :: added support for manually traversing stack elements like lua tables

Merge pull request spotx#2 from kevin-logan/kevin_is_a_scrub

Ignore /Debug/ and /Release/