added option to toggle smart quotes

Added `useSmartQuotes` option that allows to toggle smart quotes.
Also documented this.
change option name, reformat code

option name changed to `autocompleteSmartQuotes`

code reformatted to follow style
use speaking variable name includeSmartQuotes
added French quotation marks
better documentation for quotation marks
Merge pull request #39 from teoric/master

added option to toggle smart quotes