This included removing some internal version constraints. It would be
nice if package A could say "use B@2.0.0" (when both have changed), but
when they're both in the release, we need to make a release that has a
B@2.0.0-rc in it, which doesn't match that constraint. Fortunately,
constraints aren't necessary within a release anyway.
Specifically, in all Underscore "collection" functions which treat their
arguments polymorphically as either "object-like" or "array-like", don't
treat arguments with `x.constructor === Object` as arrays (except for
the 'arguments' object).
Fixes#594. Fixes#1737.
This implies that all exports are package variables, which made underscore,
jquery, and htmljs (which explicitly assigned to fields on the global variable)
break. We now properly encapsulate these packages (except for window.jQuery,
which we let sneak out because bootstrap wants it). This means that packages
that want _ need to use underscore, and packages that want $ need to use jquery.
Also, you can't use _ in minimongo $where any more (matching mongod).
