add new phone functionality implemented

- Service used to store and share newly added devices
- Created a form for adding new entries which stores entries in this service
- After fetching new entries from Phone.query() result from NewPhone.getPhones() is concatenated to the list to be displayed

THINGS NOT TAKEN CARE OF -
- UI of the form kind of sucks
- Haven't paid attention to tests in the tutorial, going through them, will add.
Made changes here.. https://github.com/rahul-pl/angular-phonecat/commit/4f8470295f04f2e9c1ebb2bced1d4a26d9ac14d1