gitignore: ignore vim swap files

Signed-off-by: Kai Blin <kai.blin@biotech.uni-tuebingen.de>
Add TempAlert class to deal with reading rpi-temp-monitor JSON

Signed-off-by: Kai Blin <kai.blin@biotech.uni-tuebingen.de>
testing: Add Travis-CI test support

Signed-off-by: Kai Blin <kai.blin@biotech.uni-tuebingen.de>