Issue #234 - Add Ehcache.putAll unit tests

Add unit tests for `Ehcache.putAll`.

This update does not address issues #238 or #239.

This update changes `EhcacheBasicCrudBase.FakeStore` to update the implementations of the `compute`, `computeIfPresent`, and `bulkCompute` methods and changes the `EhcacheBasicCrudBase.FakeCacheWriter` to implement the `writeAll` method.

The `EhcacheBasicRemoveValueTest` and `EhcacheBasicReplaceValueTest` tests were updated to adapt to the method signature changes introduced in PR #223.