check that video saved to sdcard
remove useless check before test executed
use media_files property instead of mozdevice
Use mozdownload to retrieve the B2G desktop build
Use environment variables instead of test variables
Merge pull request #1341 from davehunt/travis-mozdownload-1.9

Travis CI improvements
Merge pull request #1304 from sashakruglov/issue_104_video

check that video saved to sdcard