New version with ability to access Parser object, including Parser#metadata

[lindes]

I found these changes to be helpful for my own usage, in particular so that I could keep better track of multiple .qfx files by having access to the date information contained in them.

Because I added a new (though backwards-compatible) API on QuickenParser, I've bumped the minor version number to 0.3.0.

If you like these changes, I'd appreciate being merged in. If not, no worries!