add view controller in flash_pvt
Merge branch 'v2.0' of https://github.com/Mozilla-TWQA/B2G-flash-tool into v2.0
Merge pull request #139 from zapion/v2.0

add view controller in flash_pvt
Merge pull request #145 from askeing/v2.0

add get_available_packages_from_url(), and add unit test.
Merge remote-tracking branch 'mozilla/v2.0' into v2.0