Add support for the data-src attribute to img #66
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Fixed issue #65
data-srcwheresrcis used.data-srcis a custom attribute that complies with the HTML5 specification for data sourcesdata-srcoversrc, because data-src is usually the "real resource path", while src may be a placeholder or null value, e.g., when loading images lazily, src tends to be a placeholder, and data-src is the real image