Enables the 5th beam line representing 128th notes
Adds ability to break secondary beams using `Beam.setSecondaryBeamBreakIndices(indices)`
Rename `setSecondaryBeamBreakIndices()` to `breakSecondaryAt()`
Add metrics to glyph loader.
Fixed lint errors.
Restore line width after drawing stem.
Perfect alignment for slashnote heads.
Merge pull request #179 from Silverwolf90/enable-128th-beams

Enables the 5th beam line representing 128th notes
Update sandbox. Remove borders from test canvases.
Merge branch 'master' of github.com:0xfe/vexflow
Correctly set stem direction for chords.
Added textnote tests. Fixed beam stem direction bug.