0.15.8

New feature:
- Scrollbar.
- More custom keybindings.
Improvements:
- dmenu compatibility.
- Don't refilter on all keypresses.
- Hide Docks and desktops from the window list. (remove i3bar hack)
Bug fixes:
- Fix Desktop numbering.
- Mis-alignment of arrow down box with message (#189)
- Fix issue with mouse interaction needing keyboard press to complete.
- Fix -no-custom still allows escape to quit.
- Fix compiler warnings.
- Fix dmenu mode. (#200)
- Break CMD AI to have dmenu compatibility.
- Fix processing of signals.