Getting data from API
Added progress dialog to the asynctask
Check for internet access to call the api

otherwise shows the hardcoded data.
Clean a little the code
Save state of the PhoneNumber object on CheckActivity

The phone information is saved, and there is no need to call the API
each time the activity is destroyed. e.g. Rotation
Merge pull request #24 from KB50-G1/feature-api_phone_detector

Feature: API phone detector