Improve Telephony

[k-cross]

The Telephony generators are pretty stupid. They just return a common range of phone numbers and don't do any sort of number adjustments, which in many countries is required when calling in certain zones or internationally. This is not an area I normally work in so I'd need to do quite a bit of research to understand how the phone number system works as it's pretty complicated.

• Add a format option so that generators might be able to give formatted outputs.
• Add a common option so that it only provides business and residential numbers, not ranges like 911 or 411.
• Support for extensions
• Support for majority of countries with their own number ranges
• Only include valid number ranges
  • For instance 000-000-0000 is not really a valid number.