Calculate the sha1 hash of a String
String $.sha1 ( String str )
Calculates the sha1 hash of str using the US Secure Hash Algorithm 1.
SHA-1 the Secure Hash Algorithm (SHA) was developed by NIST and is specified in the Secure Hash Standard (SHS, FIPS 180).
This function orginally get from the WebToolkit and rewrite for using as the jQuery plugin.
$.sha1("I'm Persian.");
"1d302f9dc925d62fc859055999d2052e274513ed"