Sort also by actuall name of imports, not just by module name

[jukben]

Then would be possible something like this, to have styles always at the end.

import OtherComponentStyles from 'OtherComponent.styles';
import styles from './ThisComponent.styles';

[jukben]

I'd actually wait for palantir/tslint#4134 it looks it's getting merged soon so we can deprecate this rule entirely. (the same for #6)