BUGFIX: lists cannot be llvm_va_copy was broken, didn't copy list offset
IMPROVED: va_list offset is not hardcoded, added comments
ADDED: test to ensure va_lists work properly when copied, reinitialized etc.
IMPROVED: using spaces instead of tabs to match repository code-style
CHANGED: added myself to AUTHORS
Merge branch 'va_lists_fix' of https://github.com/Manny-MADE/emscripten into va_lists_fix

Conflicts:
	AUTHORS
	tests/runner.py