Initial "automatic" framework for test

This is just a draft. It has basic functionality, and most probably
I will refactor it in the short-term future.
This is Work-In-Progress
load multi scene resources
Merge pull request #118 from ShengxiangChen/issue1658_MultiSceneResourcesLoader

load multi scene resources
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Merge pull request #120 from ShengxiangChen/iss1658_multiSceneLoading

unsupported browsers warning