function slice( str, start, end ) {
	return sliceString.call( str, start, end );
}
Slices UTF-16 code units from a string.

@param {string} str - input string
@param {integer} start - slice start index (inclusive)
@param {integer} end - slice end index (exclusive)
@returns {string} input string

@example
var out = slice( 'last man standing', 1, 17 );
// returns 'ast man standing'

out = slice( 'Hidden Treasures', 0, 6 );
// returns 'Hidden'