#45 Configuring Map impl does not work on writable caches

[Douglas Voet]

The internal map implementation is determined in the
initialize method in the writable cache implementation.
The code checks to see if this.dataLoader is instanceof
ConfigurableMapTypeCacheDataLoader but wait,
this.dataloader is not set until the configure method!
So, this check will always return false and the default
map type will always be used. This code should be
moved to the refreshAll method.

[Anand Raman]

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committed patch for the bug. The map instance is retrieved
in the configure() life cycle call rather than the
intialize() life cycle method

anand