gitignore: add unix editor backup files

for if anyone uses vi...
remove bashism: == operator

betterspeedtest.sh: 116: [: Download: unexpected operator

because /bin/sh is dash on Debian (by default)
netperfrunner: we're supposed to ping $PINGHOST (gstatic.com or -p parameter)

I wondered how netperfrunner managed to induce so much more latency than
betterspeedtest.sh.  It turns out netperfrunner was pinging the wrong
host.  It was pinging the target netperf server, instead of the closer
gstatic.com.
Merge pull request #1 from sourcejedi/mine

netperfrunner: we're supposed to ping $PINGHOST (gstatic.com or -p parameter)