version 1.7.0

Option -e to keep the switcher.
Document usage on mobile devices.
Configurable bordercolor.
Build scripts for OpenBSD.
Fix xpm icon bug.
Feature: kill window by pressing 'k'.
Feature: line at the bottom of tile.
Show windows on scratchpad only: -d 4
Disable icons: -s 4
Prevent segfault on zero size tile or icon.