Create specs for $lt and $gt (among others) comparators

[alexandernst]

No description provided.

[alexandernst]

@obeliskos Please note that in order to test the comparators without making funny things with the code, I exposed LokiOps. It shouldn't matter, but I thought I'd mention it just in case.

Also note that the specs won't pass because gt and lt comparators are still buggy. Tests should be fixed after merging #365

[alexandernst]

@obeliskos Some "crazy" tests are missing. "Crazy" as in "comparing anything with anything".
I'm not sure what should those return. For example true > 'foobar'? new Date(2015) > 42?
Should those just return whatever the JS interpreter returns?

[techfort]

@alexandernst @obeliskos if i can interject, if you compare a boolean to a string i'd throw a new Error('change jobs, dude.') . Having said that, we can assume people know what they are doing so the result should be - as @alexandernst said - what the interpreter returns (wilth all the caveats of JS, such as {} + [] being 0, but [] + [] being '' and so on...)

[alexandernst]

I'm almost sure the current code (not this specs, but the comparators) covers all possible cases of "crazy" combinations. And when I say "almost" I actually mean "I haven't found a combination that doesn't return what it should".

Are we good with this PR? Remember that this mist be merge only after #365

[alexandernst]

Ok, now that #365 got merged, I'll restart travis here

[obeliskos]

Whew, thanks for these tests (and fixes).

[alexandernst]

No problem :)