Build: Fixes issue #1293

Building behind a proxy failed to download node and npm dependencies
Build: Redundant node download
Build: Prefer sys proxy on 407 downloading node+npm
Merge pull request #1331 from am11/master

Code: Removed explicit string interning
Merge pull request #1332 from am11/master

srv-less: relativeURLs as a parameter to parser
Merge pull request #1297 from atifaziz/master

Build: Fixes issue #1293