series.py

Corrected series.py to correctly handle an input of 0 for all three functions.
```
➜  session03 git:(master) ✗ ./list_lab.py
['Apples', 'Pears', 'Oranges', 'Peaches']
What fruit would you like to add to the list? > a
['Apples', 'Pears', 'Oranges', 'Peaches', 'a']
Please enter a number. > 2
You entered: 2, Pears
Please enter a fruit to add to the list. > b
['Apples', 'Pears', 'Oranges', 'Peaches', 'a', 'b']
```

Notice that the next fruit entered, b, was appended to the end of the list. It should have been added to the beginning of the list.

```
Please enter a fruit to add to the list. > c
['c', 'Apples', 'Pears', 'Oranges', 'Peaches', 'a', 'b']
These fruits start with 'P'
Pears
Peaches
['c', 'Apples', 'Pears', 'Oranges', 'Peaches', 'a', 'b']
I don't like b.
['c', 'Apples', 'Pears', 'Oranges', 'Peaches', 'a']
['c', 'Apples', 'Pears', 'Oranges', 'Peaches', 'a', 'c', 'Apples', 'Pears', 'Oranges', 'Peaches', 'a']
What fruit would you like to remove all of? > r
That fruit is not in the list.
What fruit would you like to remove all of? > g
That fruit is not in the list.
What fruit would you like to remove all of? > e
That fruit is not in the list.
What fruit would you like to remove all of? > c
['Apples', 'Pears', 'Oranges', 'Peaches', 'a', 'Apples', 'Pears', 'Oranges', 'Peaches', 'a']
Do you like a? > maybe
maybe is an invalid answer.
Do you like a? > no
['apples', 'pears', 'oranges', 'peaches', 'a', 'apples', 'pears', 'oranges', 'peaches']
```
You needed to ask this question for each fruit in the list. Your program only asked once.

```
Original fruits: ['apples', 'pears', 'oranges', 'peaches', 'a', 'apples', 'pears', 'oranges']
Fruits copy: ['selppa', 'sraep', 'segnaro', 'sehcaep', 'a', 'selppa', 'sraep', 'segnaro', 'sehcaep']
```