Upgrade to atom-shell@0.15.4
Make menu bar auto-hide.
Revert "Make menu bar auto-hide."

This reverts commit 64731bff468fbefa01583cece573ddd1f00656c0.
Upgrade to atom-shell@0.15.5
Merge pull request #3196 from atom/atom-shell-v0.15.4

Upgrade to atom-shell@0.15.4