issue #176 use multiple keys in remappingFunctionReturnsIterableOfEntriesForEachInputEntry
issue #176 use multiple keys in testWrongKeyType()
issue #176 use multiple keys in mappingIsRemovedFromStoreForNullValueEntriesFromRemappingFunction(),
                     remappingFunctionGetsIterableWithMappedStoreEntryValueOrNull(),
                     computeValuesForEveryKeyUsingARemappingFunction(),
                     remappingFunctionProducesWrongKeyType(),
                     remappingFunctionProducesWrongValueType
issue #176 put back suppress warnings
issue #176 use multiple keys in tests for BulkComputeIfAbsent
issue #176 minor cleaning for slightly better readability
Merge pull request #179 from aurbroszniowski/issue-167

closes #167 - multiple keys for bulk related tests