'print' statement ignores >> operator

[alanjds]

The print statement is ignoring the >> keyword:

This test script outputs AssertionError: 0 chars printed, instead of 3, after printing 'foo' in the stdout.

import StringIO

fake_stdout = StringIO.StringIO()

print >> fake_stdout, 'foo',
chars = fake_stdout.tell()
assert chars == 3, '%s chars printed, instead of 3' % chars

[trotterdylan]

This should be pretty straightforward to support:

1. Add an arg to Print() that is the object to output to (default will be nil).

2. Add code to visit_Print() that will pass the dest attribute of the Print node to grumpy.Print() in the generated code.

[alanjds]

Nice. Will pursue this, as is needed to ease the code to test #223.