Update specificity of custom keymaps
Update specificity of custom keymaps

They will now reach the same specificity as the built
in commands. Since they are applied later they will
take precedence. Thus allowing custom keymaps to override
built in keymaps.

FIxes #239

oli-obk/atom-build,noseglid/atom-build,MadcapJake/atom-build,sphaerophoria/atom-build