Imlement mechanism to iterator over a container. Implement max(iterable) and min(iterable)
setNew2: use iterator class
overlooked this one in the previous commit
Add pyElements method.
Implement all(iterable), any(iterable) and nonzero check for 'None'
Improve BoxIterator performance by reducing number of const char* / std::string conversions.
Merge pull request #55 from undingen/iterable_min_max

Updated exception handling in:
	src/runtime/types.cpp
	src/runtime/builtin_modules/builtins.cpp
	src/runtime/builtin_modules/math.cpp