Adding regression tests based on md5sums for AvianBodySize csv and sqlite imports
getmd5 works on a file, not a set of lines
Generalizing high-level regression tests to loop over datasets

Currently only handles sqlite
Updating regression tests to reflect new CLI structure
Expand CLI based regression testing to include the csv engine

Required reworking the poorly thought out data structure for
storing known md5s.
Adding CLI regression tests for MoM2003
Compare sqlite result based on dump file for consistency across systems

Binary structure of sqlite files appears to vary somewhat across version
so now we use dump files which should be consistently structured.
Merge pull request #100 from ethanwhite/tests-regression-cli

Add CLI regression testing