Display the range mode in ahs micro-state

ahs = auto-highlight-symbol
Better support of change range in ahs micro-state

ahs = auto-highlight-symbol
Fix `jj` support to exit helm windows
Change key binding for helm-css-scss to `mh`

Major mode specific evil leader key binding
Change ahs key bindings for range selection

Now they are:
<SPC> h c b -> buffer ranger
<SPC> h c d -> display range
<SPC> h c f -> function range
Update ahs micro-state documentation in readme

ahs = auto-highlight-symbol
Background color for current range state in ash micro-state

ahs = auto-highlight-symbol