add mixed arguments (string, array with strings, object with strings) - to library funcs support

The improuvment required.

All func must get not a strings, but a mixed argument: string, array of strings or object. Then fuc must check arg in typeof() and if the arg is array call _.each() for each element of array or object.
F.e.
var w = _.words(" a, b, c ", ",");
var trimmed = _.trim(w);