Blender 2.78b: the add-on "Easy HDRI"
Get the add-on here:
http://codeofart.com/easy-hdri/
And these are some sites for free HDRIs:
http://www.hdrlabs.com/sibl/archive.html
https://www.blenderguru.com/pro-light...
p.s.: Sorry for the bad color management of the video. Everything seems to be multiplied by 0.5grey. Am not sure why...