Added sniffer, removed unused imports, fixed label
Added sniffing method
Refactored counting to be an internal method

For large genbank files with maybe 5-10 sequences, users would like to know which genomes are
contained in the file. This way we can store the sequence LOCUS name whilst counting.
Sequence names are now metadata and used in blurb

For large files this will be more useful than for small files, I imagine. Whenever a user uploads a
multi-record genbank file, they now see

        2 sequences [HE614281,HE614282]
        format:genbank, database:?

This extra information can be helpful if you're working with a collection of genbank records as a
single file. For sequences with many, many records, we've cut off the sequence listing at 10 values:

        14 sequences [HE614281,
        HE614282, HE614281,
        HE614282, HE614281,
        HE614282, HE614281,
        HE614282, HE614281,
        HE614282, ...]

Though that number could probably stand to be decreased
Merge pull request #64 from bgruening/genbank

Updated genbank support