Remove target directory from repo
Fix error in reading Fasta files

-Added additional test cases around files with slightly different but
valid formats
- Added ability for Fasta string reader's buffer size to be set during
creation.
- Added tests for Fasta string reader at buffer sizes of 1, 10, and 100
- Updaed parsing logic to handle a failure when the last position in the
buffer was '>'
- Cleanup output directories from repo.