Commits on May 20, 2017

1. Move nightly upload script into Mach …

   Now that MinGW and MSYS have been removed from the Windows builders,
   bash is not available to run the previous upload_nightlies.sh script.
   Convert the script to Python 2 for cross-platform support.
   Additionally, switch to the `boto3` library for easy uploading
   without needing to install `s3cmd`,
   and move the code into mach for easy `boto3` installation
   as the new `./mach upload-nightly` command.
   
   Also, hard-code the paths to the packages instead of using
   globs to look for them, as the paths are static.
   (The paths used to contain timestamps,
   but we now insert timestamps when uploading to S3
   to improve reproducibility.)

   

   aneeshusa committed May 20, 2017

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