Update screenshots and branding
Change name back to GNOME
Update preview image
Less clunky preview
Merge pull request #268 from chpii/master

Update screenshots and branding
adjusted the intro text a bit & added a link to the releases page
added links to the tweak extension
Merge remote-tracking branch 'upstream/master'

Conflicts:
	README.md
	screenshots/screenshot-tabs-on-bottom.png