Remote BAM support, etc

-- Support (via htslib) for remote BAM access for FTP, HTTPS, Google Cloud etc.
-- Additional parameters for FermiAssembler are now accessible
-- Improved FASTQ/FASTA reading are now incorporated into FastqReader (via klib).

Minor issues resolved:
-- name collision when linking both fermi and bwa
-- zlib now used for reading gzipped VCF and BED files in GenomicRegionCollection
-- more GenomicRegionCollection interval ops are templated in both the query and subject
-- fixed issue where kt_for was unnecessarily spawning new threads in BFC