Make fetch-thirdparty-deps.ps1 work on more Windows platforms.
Merge pull request #7205 from ScottNZ/nuget

Make fetch-thirdparty-deps.ps1 work on more Windows platforms.
Use travis_retry to reduce the nuget timeout errors.
Merge pull request #7216 from pchote/travis-retry

Use travis_retry to reduce the nuget timeout errors.
Merge remote-tracking branch 'origin/bleed' into bleed