BUGFIX: avoid unrelated relations in model save
Make last decoder more robust wrt same-span EDUs
Tidy up: Rename exportGraph to export_graph
Note on seemingly stray argument
Support learning attach/rels w different learners

Also give up on notion of multiple learners
(we always pick the first requested one anyway).

It's only really relevant for the test harness, and
it's not clear that this sort of thing isn't better
supported by a dumb shell script anyway.
Merge remote-tracking branch 'pascal/master' into perceptron

Conflicts:
	attelo/harness.py
Bugfix: update reporting code to match arg changes
Reformat MST decoder
Bugfix: return rels from prob dist in MST decoder

Previously, the MST decoder was systematically returning the
same label for all links in the same graph. This is because
the bit that returns labels wasn't actually implemented, and
it was instead was grabbing the labels from a value in a for
loop that should have fallen out of scope.

The oversight went unnoticed due to Python silliness:
https://mail.python.org/pipermail/python-ideas/2008-October/002109.html
Merge branch 'perceptron'
minor edit to README.md