update scrooge denepdency, add unit tests for reading in scrooge
downgrade scrooge version to 3.6.0, which is the latest version on maven central
specify scala version for scrooge
use class.getName
update scrooge to 3.8.0
Merge pull request #171 from Parquet/scrooge_tests

update scrooge denepdency, add unit tests for reading in scrooge