Allow to use PAKET_GITHUB_API_TOKEN from environment variable for github dependencies - http://fsprojects.github.io/Paket/github-dependencies.html#Using-a-GitHub-auth-key-from-environment-variable
BUGFIX: Look for OutDir in .vcxproj - #1870
USABILITY: Skip invalid meta-data in cpp projects - #1870
USABILITY: Add better tracing during resolve - #1871
USABILITY: Use .dll as default during pack - #1870