string to convert
string with expanded contractions
var str = 'I won\'t be able to get y\'all out of this one.';
var out = expandContractions( str );
// returns 'I will not be able to get you all out of this one.'
var str = 'It oughtn\'t to be my fault, because, you know, I didn\'t know';
var out = expandContractions( str );
// returns 'It ought not to be my fault, because, you know, I did not know'
Expands all contractions to their formal equivalents.