fixed macro expansion
changed macro syntax to %{} instead of $()
Added a NullConfigurationService class
added "dirName" and "baseName" utility functions
added utils for switch cases with strings
s3: the used prefix already ends with the delimiter
Merge pull request #84 from datacratic/hash_table_switch

added utils for switch cases with strings
Merge commit '9a6857ca388c650bae682aeef8e190609261d90f'