Added NatGeo & VIVA white logos

Own production :)
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Merge pull request #634 from vpont/master

Added NatGeo & VIVA white logos
BBC HD white logo
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Merge pull request #635 from vpont/master

BBC HD white logo
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TVN Turbo black + white (SVG)
Merge pull request #640 from vpont/master

TVN Turbo black + white (SVG)
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