Add possibility to change view mode (split or unified)#13

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Anicky wants to merge 3 commits intoKeenegan:masterfrom

Commits on Oct 4, 2018

Add storage permissions in manifest.json to remember user's decision about view mode
Jérémie JALOUZET
committed
Add button to change view mode (split or unified)
Jérémie JALOUZET
committed
Add CSS for header and buttons
Jérémie JALOUZET
committed