Update docs to recommend install rather than update

Close #5903
npmconf@2.1.0

Set and get always-auth on per-registry credentials.
npm-registry-client@3.2.2

Consume the new per-registry always-auth settings.
request@2.44.0
support saving --always-auth on adduser
use writeFileAtomic instead of fs.writeFile fixes #6163
reintroduce omitted chown (thx iarna!)
Allow init without prompt
init-package-json@1.1.0

part of #5925
update changelog for npm@2.0.1
2.0.1
Add fs-write-stream-atomic dep
Make all write streams atomic

IT IS ALWAYS A #%@^& RACE CONDITION!
trivial spacing fix
Raise error when tar.unpack encounters a 0-byte tgz
write-file-atomic@1.1.0

use graceful-fs like everything else
update changelog for npm@2.0.2
2.0.2
update docs, fixes #4343
fixes #5867, replaces #5790: no git hooks

Specify dummy template dir when cloning to prevent copying hooks.