Handle slicing SeqRecords

Handle empty sequences when outputting fasta

Update biopython to 1.79 and handle dumping Seq object

Fix creation2 test

Clean up json/txt/yaml output and add more tests

Calculate file diff for tests rather than hash

Update dependencies. Biopython now outputs correct line lengths, upda…

…ted test hashes

Fix missing variable init

Merge branch 'master' of github.com:brinkmanlab/BioPython-Convert

Update README