Add comma

http://en.wikipedia.org/wiki/Serial_comma
Adding comma:

http://en.wikipedia.org/wiki/Serial_comma
More comma cleanup
Comma cleanup
More comma clenaup
More comma cleanup
More comma clenaup
Remove trailing whitespace
Fix trailing whitespace
Trailing whitespace cleanup
Whitespace cleanup
Whitespace cleanup
Whitespace cleanup
Whitespace cleanup
Whitespace cleanup
Whitespace cleanup
Whitespace cleanup
Whitespace cleanup
Whitespace cleanup