Default the react mini editors to on
Default to on in the specs
Upgrade to atom-shell@0.15.7
Merge pull request #3286 from atom/atom-shell-v0.15.7

Upgrade to atom-shell@0.15.7
Preserve invisibles in editor model across serialization

Fixes #3281
Upgrade to open-on-github@0.30
Upgrade to language-less@0.14
Upgrade to language-yaml@0.16
Start shipping language-mustache
Merge pull request #3261 from atom/bo-default-react-mini

Default to the react mini editors
Upgrade to language-gfm@0.47
Upgrade to space-pen@3.4.1
Assign ::firstNonWhitespace/TrailingWhitespaceIndex in Token::split

Fixes #3277
Swap order of `ctrl-w` and `ctrl-f4`

This allows `Ctrl-W` to appear in the system menu again until
the atom-shell issue with function keys is fixed.

Refs atom/atom-shell#485
Closes #3283