Merge pull request #25 from natgeo/develop

Update master with develop
Display custom number format in large numbers of favorites
Update code according to comments of the PR
Change logic to use sprites insted images
Add _icons.scss file
Add return character in _icons.scss
Add return character in _icons.scss
Merge pull request #26 from natgeo/feature/MIE-1389

Feature/mie 1389