fixed the u_char type for MinGW which lacks it.

fixed the u_char type for MinGW which lacks it.

Makefile: added explicit .c -> .o rules to help MinGW.

updated .gitignore.

fixed one spot of memory leak reported by bearnard.

added tests for bad RDS input; also improved the error messages retur…

…ned to the user.

fixed compilation errors on Mac OS X, thanks @hugozhu; also switched …

…to standard lua interpreter in the test scaffold such that we can run our tests with valgrind on Mac OS X.

updated README a bit.