use gutil instead of console in gulp tasks

[fulls1z3]

I'm submitting a ... (check one with "x")

[ ] bug report => check the README and search github for a similar issue or PR before submitting
[ ] support request => check the README and search github for a similar issue or PR before submitting
[X] feature request

Current behavior During code review, console seems as an unexpected statement.

Expected/desired behavior console should be replaced by gutil.

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

• Angular version: 2.0.X

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

• Language: [all | TypeScript X.X | ES6/7 | ES5]

• Node (for AoT issues): node --version =

[fulls1z3]

Closing because it already passes the code review