Tool addition: JS minifier

[theonlyasdk]

Like #4, JS minifier would strip all unnecessary whitespace and remove all comments. Please note that this is different from JS obfuscator and this tool should not make any changes to the actual code apart from whitespace or newline removal.

EDIT: This should NOT remove all the spaces inside the given JS code, as the JS code might have strings which have spaces inside them, so replacing them would mean modifying the functionality of the code.