Fix IE11 DataView issue

data.constructor.name is "DataView" in FF and Chrome, but undefined in
IE.
Fix inconsistent behaviors of the slider between browsers.
Merge pull request #24 from fpirsch/fix-ie11

Fix support in IE11.
Make 'ot' accept a single font file.
Add GPOS kern information parsing.
Update Grunt packages to latest versions.
Add reference to the Adobe CFF specs.
Add JSHint configuration files.
Add a `npm test` task that checks code quality.
Fix all JSHint warnings.
The ot tool now properly reports errors.
Make code pass JSHint again.
Use coverage info to ignore certain kerning values of classes.
Fix jshint warning
Resolve conflicts