Converts and returns the argument passed in a string in md5 format.
Example
```javascript
//"486eb65274adb86441072afa1e2289f3"
bbn.fn.md5("this is a test string");
```
Converts and returns the argument passed in a string in md5 format. - This is a formatted version of popular md5 implementation
Original copyright (c) Paul Johnston & Greg Holt.
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