Start of a parser, but ugly

Signed-off-by: Ricky Elrod <ricky@elrod.me>
Handle newlines better

Signed-off-by: Ricky Elrod <ricky@elrod.me>
Add haddock comments in Bio.Parse.Sequence.FASTA.

Signed-off-by: Ricky Elrod <ricky@elrod.me>