Combine duplicate phone numbers

[aaasen]

Currently, +12061234576, 2061234567, and 1234567 are treated as phone different numbers. The first two should certainly not be treated this way, but the third could potentially be a different number.

Potential resources:

• http://developer.android.com/reference/android/telephony/PhoneNumberUtils.html

Thanks @Henguin1001 for finding this bug!