Gallery mobile/tablet layout settings

[ravichdev]

Summary

Fixes #491

Checklist

• My pull request is addressing an open issue (please create one otherwise).
• My code is tested and passes existing tests.
• My code follows the Contributing Guidelines (updates are often made to the guidelines, check it out periodically).

[emeaguiar]

@ravichdev These changes are approved, just want to confirm, is develop the correct branch to merge these in?

[ravichdev]

@emeaguiar Yes develop is the correct branch, this is a feature and we want to include that in 0.2.* release