====== generatePassword ======
Returns a randomly generated string of specified length.
===== Syntax =====
generatePassword = function(aLength);
==== Parameters ====
* **//aLength//**
* //functions:// length of the resulting string
==== Returned value ====
* //functions:// random string
===== Notes =====
* The resulting string can contain only the following symbols: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789
===== Examples =====
-var pass = generatePassword(15);
//pass = '3h9kYj9eeDL0Ju4'
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