Export fixes

This PR fixes some of our exports:

* The functions of the ol.animation namespace should be exported as symbols, as opposed to properties.
* Likewise for the functions of the ol.easing namespace.
* There's no need to export the namespaces themselves.

(I need this change for my work on [custom controls](https://groups.google.com/forum/?fromgroups=#!topic/ol3-dev/pAlnkanZ0hw)).