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enable destroy-ing a key with falsy data
Merge pull request #32 from seako/fix-for-keys-with-falsy-values

enable destroy-ing a key with falsy data
dump 0.3.2
better patch. doesn't require loading all settings first.
Merge pull request #34 from seako/fix-for-keys-with-falsy-values

better patch for destroying keys with falsy values. doesn't require loading all settings first.
Inprove test, update README.
Fix test.
Allows setting a serializer in an initializer configuration.