Read a FASTA file containing multiple sequences, extract the definition and sequence from each.

[0x106]

Fasta files contain multiple sequences, delimited by an empty line. Each sequence contains a header line that begins with '>' and then multiple lines of sequence data.

This pull request assumes that there are one or more sequences per file, and reads them into an array. Sequence.Definition and Sequence.Sequence are populated per sequence.

The sequences themselves are not validated, and nor are the header lines.

[TimothyStiles]

@0x106 this looks awesome. The only thing I'd do is create a separate BuildFasta function from WriteFasta but these changes can be squashed and merged before then. I'll also close out issue #10.