Add phoneUS filter from angular-filter

[a8m]

see: https://github.com/a8m/angular-filter#phoneus

[rafaelss95]

I commited a initial version on 5833ebd. By the way. I think we can do much more than a simple pipe for US phone, in other words, we can expand it and make it a general pipe for as many country as we can. I added just two countries on this initial version. What do you think about it and about the logic that I'm using in this pipe?

[a8m]

I like it. great job

We need to take this logic and copy it to angular-filter. it just makes more sense.