Improve support for embedded systems like OpenWrt #42
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Embedded systems like OpenWrt don't have either stty or tput commands. But we can fall back to using bash itself in interactive mode to discover the terminal size.
Busybox ping prints sequence numbers as `seq=xxx`, rather than `icmp_seq=xxx` like most other ping utilities.
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OpenWrt (and perhaps other embedded systems):
sttyortputcommands to discover the terminal size.This PR fixes both, by: not complaining if tput fails, falling back to bash itself to discover the terminal size, and supporting Busybox ping's output format.