Adding a 7/10 + international phone validator (with optional dashes or f...

Just added a simple phone validator. Please check it out - even if its needed at all, and I could update the docs and the tests. 

So far it passes ([] denotes optional)
[country] + [area] + number

Matches following: 

* 555 555 5555
* (555) 555-5555
* (555)555-5555
* 555-555-5555
* 555.555.5555
* 5555555555
* 0-000-000-0000
* 0.000.000.0000
* 0 000 000 0000
* 00000000000
* +0-000-000-0000
* +0.000.000.0000
* +0 000 000 0000
* +00000000000