Simplified file loading option?

[bucanero]

Hi,

Could we add another loading option that takes a file path string and returns the XML tree?

Something like:

mxml_node_t *tree;

tree = mxmlLoadFilePath(NULL, "/path/to/filename.xml", MXML_OPAQUE_CALLBACK);

I know it's a trivial wrapper on mxmlLoadFile() but I think it could be useful for new users.

[michaelrsweet]

Added in latest Git master.