[joeyvandijk] RIMG 1.5.0

[joeyvandijk] Source: https://github.com/joeyvandijk/rimg/blob/master/rimg.min.js

Async bug fixed + scroll/lazy-load added + breaking change with RimgBreakpoint into RimgOptions + faster looping through images + better input-validation + added more examples in /test 1.0.0 IE8 support + fixed bugs