Merge pull request #106 from tsujigiri/go_parser

Build Go worker using rake
Fixes minor bug with build process
Worker now dies on fatal error message
Fixed some commented liens
Slightly better logging
Slightly better error-handling, testing still doesn't work
Cleans up the go-worker a fair bit
Turns out, pg's rows can also return errors. Also, sometimes logger doesn't really work for some reason
Fixes typo
More  idiosyncratic genotyping SELECT statement, we only expect one returned row
Fixes bug in preparsing
Fixes bug in decodeme parser. Finally, parsing tests pass (others fail though). Currently investigating how to turn off fixtures for just one test.
Better test for existing genotypes, without IDs
Adds new gem for manual database cleaning. All tests now pass :3
Adds test for AncestryDNA. Functionals still fail (or is it again?)
Make DatabaseCleaner clean on teardown