Merge pull request #958 from tschaub/requires

Make the `build/check-requires-timestamp` target work with namespace provides in cases where the namespace provide isn't required by a module that provides constructors or other objects within that namespace.  This may seem a bit odd, but if I want to provide `foo.bar.Bam` it isn't strictly necessary that my module require `foo.bar`.

To make this build target work, we stick with the following convention (used in the Closure Library):

 * If you want to make a function available via `goog.require`, use `goog.provide` to provide the object of which the function is a member (e.g. to make the `foo.bar.baz` function available, use `goog.provide('foo.bar')`).

examples/ten-thousand-points.js

@@ -1,8 +1,8 @@
 goog.require('ol.Map');
 goog.require('ol.RendererHint');
 goog.require('ol.View2D');
+goog.require('ol.control');
 goog.require('ol.control.MousePosition');
-goog.require('ol.control.defaults');
 goog.require('ol.geom2.LineStringCollection');
 goog.require('ol.geom2.PointCollection');
 goog.require('ol.layer.TileLayer');