Issue #75: wired CacheLoader where applicable.

Don't understand this comment. `Ehache.get()` eventually calls `CacheLoader.load()` for missing keys, which is mocked to throw an exception. We are testing that `Ehcache.get()` propagates the exception by wrapping it in a `CacheLoaderException`.

If I had more test logic after `Cache.get()`, I would agree with you. As it stands, the test is written sufficiently to verify the assumption about exceptions thrown by the implementation when interacting with cache loaders. Also, if you look at the rest of this class, it uses the same pattern for other interactions with the chosen CacheWriter/CacheLoader.