Added a zoom toolbar

v2.3.0

Changed debug styling

v2.2.3

Changed debug styling again

Minor style changes to debug info

v2.2.2

Updated binary to 2.2.2

Made debug info in html instead of SVG

Implemented debug info in html instead of injecting into the SVG docu…

…ment, cleaned some comments

Using scroll zoom, removed box zoom by default

v2.0