add bindeps for blast and bowtie2 dependencies
add deps for bindeps, update travis install script
fix travis build script
Merge branch 'master' into samtools
ignore blast test output files
contig fully implemented with tests
fix enumeration of contig bases
bring contig metrics in line with new contig model
fix test data filename in ComparativeMetrics test
update inline tests for new Contig model, cleanup style
add more BLAST test artefacts to .gitignore
move basic assembly stats to use new Contig model