makes the beams look OK on the second draw
adds breve notes
merged with upstream
roll back some beaming changes
adds breve notes as duration 0
breves now duration of 0.5
breve notes use b or 1/2
can't give breves a b duration anymore
changes tests to not use b duration breves
no ledger lines for rests.
stops beam stems from being messed up the second time you draw them
Merge branch 'breve' of https://github.com/ssoRL/vexflow into breve
Try to compare fractions as much as possible.
Merge pull request #251 from mscuthbert/methods

No ledger lines for rests.
Methods for stave
autostem for beams