Add deromanize command, minor enhancements

Add deromanize: Convert Roman numerals to Arabic in given column
fastx-stats: Report standard deviation of sequence length

Numerous improvements and bug fixes

Add vcf-downsample subcommand
Improvements to build system
extract-seq: Recurse to output subfeatures
Numerous other minor enhancements and fixes

New subcommands, numerous small fixes and enhancements

New commands:
fastx-stats: Report basic info on a FASTA/FASTQ file
ensembleid2gene: Report gene name associated with Ensmbl ID
Improvements to test scripts
Several minor bug fixes and enhancements

"blt" wrapper, new subcommands, several fixes and enhancements

Make all programs subcoimmands of "blt" to avoid potential comflicts with other applications.
(Similar to samtools, bedtools, etc.)

Add --version flag

New subcommands:

fastx-derep: Remove replicate reads from FASTA or FASTQ
fastq2tsv->fastx2tsv: Convert wrapped FASTA/FASTQ to TSV for easier searching and filtering
fasta2seq: Convert a FASTA stream to one long raw sequence
find-orfs: Locate the next start or stop codon in a sequence
vcf-search: Search a VCF file by chrom and pos
gff2bed: Convert GFF3 stream to BED
extract-seq: Extract a sequence from a `FASTA for a feature in a GFF
chrom-lens: Generate a TSV file containing chrom lengths for kallisto

Numerous minor fixes and enhancements

First release for packaging

Basic testing complete for fastq2tsv and fastq-dedup.