Added test for localStorage Service
Added input fields bittering hop values

* Added input for bittering hop name
* Added input for bittering hop boiling time
* Added function for bittering hop ibus
* Added bittering hop ibus to hop bill
Refactoring

* Extracted local variables in hop calculation
Added mulitple hops to hop bill

* Extracted Hop class
* Added bittering hop row to hop bill
* Added multiple flavor hop rows to hop bill