add network check to address
add check to core, not only UI
fix tests
Merge pull request #818 from maraoz/bug/addresses-check-network

check network for addresses

* Chrome 35.0.1916 (Mac OS X 10.9.3): Executed 76 of 76 SUCCESS (0.806 secs / 0.239 secs)
* mocha:   170 passing (8s)
* browser: 100%: 128.16s


Code: OK (I am starting to like preconditions :+1: )