build-osx

This is a script I've been using locally which does everything suggested in the Compile.rst document short of installing the compiler and perl libraries needed.

Specifically, it:
1. creates build-osx (which is covered by .gitignore)
2. patches luaTypes.cpp
3. compiles
4. installs to the df_osx directory it was fed
5. unpatches luaTypes.cpp (keeping the repo clean)
You might want to consider parallel builds here (either by providing an option or using something like `make -j$(sysctl hw.ncpu | cut -f2 -d' ')`)