Basic browserify support for lib and tests.
Remove VexTab dependency from Jison.
Clean up build scripts. Configure staging task.
Add missing libs to package.json.
Make TavDiv standalone binary work. Update docs/.
Always use latest vexflow.

This helps ensure that changes to VexFlow won't break VexTab, via
the Travis continuous integration tests.
Move coffeeify to main dependencies.
Update VexTab URL in package.json.
Made tests/playground work with the NPM package.
Update README with developer docs. Build playground by default.
Improve README.md.
More documentation cleanup.
Remove playground from main build. Breaks travis.
Add releases to repository.
Update documentation with more about TabDiv.
Release v2.0.8
Committing release binaries for new version: 2.0.8