Use older node version for appveyor

Looks like a race condition might be biting us:
http://help.appveyor.com/discussions/problems/865-error-running-npm-install
Merge pull request #2566 from raytiley/appveyor-node-version

Use older node version for appveyor
Prevent crashes in http-proxy

This closes #1921.

`connect-restreamer` is fundamentally nuts and rather fragile. It also
makes no sense when we can just avoid the issue entirely by putting
`http-proxy` ahead of `bodyParser`.

People who have already run the proxy generator probably need to be
warned that they won't benefit from this bugfix.
Merge pull request #2568 from ef4/proxy-fix

Prevent mangled POST bodies in http-proxy
adding an addon postprocess hook for all javascript
extensible whitelist filters
Add --silent option for quieter UI

Passing the --silent command to any command will supress all output from
the UI expect errors.

Introduces write levels to the UI object. Changes pleasant-progress
commands to pass through the UI object first.  The UI simply delegates
the commands to it’s `PleasantProgress` object.
Merge pull request #2505 from ef4/ember-browserify

Automated npm/browserify/cjs loader
Merge pull request #2574 from chenn/master

Add --silent option for a quieter UI
[wip] - more tests pass on windows
Create junction when linking ember into addon

We can't rely on symlinkOrCopy fallback becasue copying a directory into into one if its own subdirectories is crazy
junction in all the slow tests

Also fix npm version to resolve installing bug on win
add EOL to restart tests
Use ipc to kill process on windws

when using kill windows does not get a SIGTERM event so files are not cleaned up correctly