changed the form group identifier

now the form will be identified by form selector that contains all the
elements that need to be validated, passed in the $.validate function as
parameter.
type property added

A type property is added that makes replacement for url, alphanumeric,
number, email etc properties which is now passed as string of object
values to type. When string: it just mentions the type like 'url',
'alphanumeric', 'email'. When object must contain the following
properties: value : "alphanumeric", errMessage: "hello error!!".
overlay, type improvement