Added type to tree entry object

[dubcanada]

Hey,

I needed quick access to determine easily if the tree entry object is another tree or a blob. So since this is already retrieved, just not returned I added it to the returned array.

[alexandresalome]

Sorry, you can already have this information by testing type of the object: $entry[1] instanceof Tree or $entry[1] instanceof Blob.

[dubcanada]

Is there an instanceOf submodule? Or a way to determine if the "tree" is actually a "submodule"?

[alexandresalome]

That's not implemented, but surely should be.

[alexandresalome]

Closed in favor of #12