Without this, we are limited in the key names that we can accept from users. And because of compiler renaming, we don't know ahead of time what the limitations are (e.g. the key 'a' may clobber the 'set' method).
With this commit test files provide namespaces (using goog.provide). This fixes the issue reported by @bartvde where goog objects cannot be used in Jasmine "describe" functions. It also frees us from having to add script tags for the test files in test/ol.html.
