HUB: Use 'crypto' package for random HEX gen; generalise countClients method; cleanup type coercive comparators 

* I added the core Node `crypto` package as a dependency (requiring Node >0.6) and have implemented it in the `generareId` method. Generating randomness is hard, let the kernel do it where it's been tested extensively.
* I generalised the 'countClients' method into a 'countObj' method, as it's being used for other things besides counting clients. I also refactored it to use `Object.keys(count).length' as it'll be faster than iterating over the object and incrementing a counter.
* I also removed all the bad comparators, now no comparator is coercing type: `!==` not `!=` and `===` not `==`

I've working on a much larger refactor of this hub code at the moment, this was just the long hanging fruit.

Awesome project btw!