Better behaviour when no image is found

props to @szrenwei

Lots of bug fixes

Merge pull request #138 from Gaya/remove-child-checking

Fix no overlay removal check

3.0.9: Merge pull request #125 from Gaya/instant-overlay

Instant overlay

3.0.6: Merge pull request #106 from Gaya/fix-background-none

Fixes 404 with "none"

3.0.4

• Fixes #101: attribute id was missing on the percentage element which was present in older versions.

Total rewrite, no more jQuery

This rewrite of this script ditches jQuery as a dependency and add npm / Browserify support.
You can still use it with jQuery if you want to.

2.9.0

Updated version numbers and special thanks in Readme