Render slash notes with upstems correctly.
Don't fill "h" or "w" notes in slash heads.
Updated VexFlow index page.
Added support for text notes.
Allow text notes to have no width for top annotations.
Updated index page.
Show license on README.
Textnotes can have ignored ticks.
Update src/annotation.js

annotation always at bottom
Merge pull request #82 from wuqi/patch-1

Fix == / = bug in src/annotation.js.
Throw error on invalid articulation.
Text annotations must not draw over notes.
Make articulations and annotations get along on the same staff.
Make BarNote draw with StaveBarline.

- Also add support for double repeats.
Add support for glyphs in text notes.
Remove trailing commas for IE.
Update index music.
Fix front page.
Add ability to specify stem diretion for auto beams.
Add support for setting absolute audio notes.