(CFACT-89) Use AppVeyor for Windows CI

Add yaml file to configure AppVeyor builds.
(CFACT-89) Update pre-built Boost location

Use Kylo's Puppet Labs S3 bucket for the pre-built package.
Merge pull request #128 from MikaelSmith/task/master/CFACT-89-enable-appveyor

(CFACT-89) Use AppVeyor for Windows CI