function expandContractions( str ) {
	var tokens;
	var token;
	var out;
	var key;
	var i;
	var j;

	if ( !isString( str ) ) {
		throw new TypeError( format( 'invalid argument. Must provide a string. Value: `%s`.', str ) );
	}
	out = '';
	tokens = tokenize( str, true );
	for ( i = 0; i < tokens.length; i++ ) {
		token = tokens[ i ];
		if ( isCapitalized( token ) ) {
			for ( j = 0; j < KEYS.length; j++ ) {
				key = KEYS[ j ];
				if ( uncapitalize( token ) === key ) {
					token = capitalize( CONTRACTIONS[ key ] );
					break;
				}
			}
		} else {
			for ( j = 0; j < KEYS.length; j++ ) {
				key = KEYS[ j ];
				if ( token === key ) {
					token = CONTRACTIONS[ key ];
					break;
				}
			}
		}
		out += token;
	}
	return out;
}
Expands all contractions to their formal equivalents.

@param {string} str - string to convert
@throws {TypeError} must provide a string
@returns {string} string with expanded contractions

@example
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.'

@example
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'