Use "dub.json" instead of "package.json" in documentation
Use "dub.json" instead of "package.json" when reading from zip archives
Renamed all "package.json" files to "dub.json"
Merge pull request #337 from jrtc27/dub-json

Use new dub.json file everywhere
Converted line endings from CRLF to LF
Removed trailing whitespace