Add setProxyAuthentication() in std.net.curl
Make std.file.readLink safe
Merge pull request #2597 from tom-tan/safe-file-readLink

Make std.file.readLink safe
Merge pull request #2581 from schuetzm/proxyuserpwd

Add setProxyAuthentication() in std.net.curl
cache doc
Merge pull request #2599 from monarchdodra/cache3

cache doc
some doc updates and some more testing