fix(commands): ember-cli branding leaks through many error messages a…

[jkuri]

Prevent ember-cli version message on every executed command. Also applies on warning when overriding core ember-cli commands and replaces all ember output strings with ng.
That was a known issue and I removed it from README.md.

[jkuri]

Closes #12

[Brocco]

@IgorMinar please take a look at this, I know you had some thought about how to handle this issue.

[cironunes]

it's fair enough for now. lgtm

[jkuri]

I believe this is the only way to get rid of the ember-cli leaks. I made some investigation on this and noticed; lookup-command.js and cli.js are coded in the way that cannot be overriden. So, this "hacky" thing to intercept node stdout and stderr before printing is in my opinion the only solution to this problem.
Btw, I also noticed serve.js, which should solve the Windows users issue due to lack of performance not running as administrator. Since we upgraded ember-cli to version 1.13.15 this should also be resolved, but this need to be tested before removing from README.md as known issue.

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