add predicate function builder

[katunilya]

In order to provide even better and consistent interface for iterable.filter
functions of all kinds it seems useful to provide some builder function for
predicates - callables that take some object and return boolean.

First of all I promote separation for "simple" and "complex" predicates,
where "simple" predicates look like:

Basically I propose the following functions:

• all_
• any_

And buider class where (lowercase like built-in python map or filter).