Add limited random latency feature

[asyncanup]

Really needed the feature to simulate real-world latency, so here it is :)

Usage:

$.mockJSON('/mock-request', template, 1500);

Now this request will return some time between 0 and 1500 ms.

Second, allowed arrays to be entered in template without a compulsory vertical bar "|", so that static arrays can be a part of the template.

Additionally, moved the sections of code around a bit for better comprehension and JSHint compliance, but that's a matter of style, so I would just move it back if you say so :)

[asyncanup]

I would be willing to write some tests as well, if you think that's helpful..
I've been using this library for quite a while now, it's awesome :)

[asyncanup]

Would fix #4 as well