v0.2.0

Under new management.

This release contains a fair few updates and fixes pulled in from various pull requests made over the years - thanks all who contributed.

Changes:

• Can now use custom data attribute name to tag elements
• Now uses 4 overlays above/below/left/right of the target element to ensure it shows through.
• Can offset the tooltip along the element edge
• Optionally allow sequential stepping through elements
• Optionally fetch help tooltips from json file dynamically sourced from a get request
• Various minor fixes.