add Eclipse .project to gitignore
added treble_8va, treble_8vb and small variants

Tests work (I commented out some of the stave.addEndClef() tests to
make room — hope that’s acceptable). What does not work yet is clefNote
changes — I’m unclear how to set multiple glyphs in it.
fixed indentation and tests for 8va clefs
Merge branch 'vexflowClef' of https://github.com/mscuthbert/vexflow into vexflowClef