Keybinding Resolver conflict with Emmet

[kmilov]

There is a conflict with the ctrl+M key map when the user have the Emmet package installed.
This change will prevent the error. also, the Keybinding resolver doesn't support the comma operator.

[kevinsawicki]

This should use the data attributes instead and keep targeting the element instead of the class.

atom-workspace atom-text-editor:not([mini])

See https://github.com/atom/atom/blob/74a627d41b41ce39e0a5ad43a08dbd4ce2a46fcc/keymaps/darwin.cson#L139 for an example

[kevgathuku]

@kmilov @kevinsawicki Mind if I take this on? This is still an issue for me when I have both the emmet and markdown-preview packages installed.