autoflash.sh v11.7 helix supported
Merge pull request #15 from zapion/master

Update v11.7, helix supported
Fixed -p bug of change_OTA_URL
Merge branch 'master' of https://github.com/Mozilla-TWQA/B2G-flash-tool
Modified change_OTA_URL for MAC cannot run $(date --date='2 days ago' +%s)