In absence of "sublimelinter_show_outlines" setting, assume True
In absence of "sublimelinter_show_outlines" setting, assume True

This preserves the previous behavior when the setting isn't set.

benesch/sublime-linter,biodamasceno/SublimeLinter-for-ST2,tangledhelix/SublimeLinter-for-ST2,SublimeLinter/SublimeLinter-for-ST2,uschmidt83/SublimeLinter-for-ST2,biodamasceno/SublimeLinter-for-ST2,uschmidt83/SublimeLinter-for-ST2,tangledhelix/SublimeLinter-for-ST2,benesch/sublime-linter,SublimeLinter/SublimeLinter-for-ST2