Add HTSLIB

Author: Yenaled

ext/htslib/.gitignore

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+*.o
+*.pico
+/version.h
+
+lib*.a
+lib*.dylib
+lib*.so
+lib*.so.*
+
+/bgzip
+/tabix
+/test/fieldarith
+/test/hfile
+/test/sam
+/test/test-vcf-api
+/test/test-vcf-sweep
+/test/test_view
+/test/*.tmp
+/test/*.tmp.*
+
+/TAGS

ext/htslib/.travis.yml

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+# Control file for continuous integration testing at http://travis-ci.org/
+
+language: c
+compiler:
+  - clang
+  - gcc
+
+script: make -e && make test

ext/htslib/README.md

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+HTSlib is an implementation of a unified C library for accessing common file
+formats, such as [SAM, CRAM and VCF][1], used for high-throughput sequencing
+data, and is the core library used by [samtools][2] and [bcftools][3].
+HTSlib only depends on [zlib][4].
+It is known to be compatible with gcc, g++ and clang.
+
+HTSlib implements a generalized BAM index, with file extension `.csi`
+(coordinate-sorted index). The HTSlib file reader first looks for the new index
+and then for the old if the new index is absent.
+
+This project also includes the popular tabix indexer, which indexes both `.tbi`
+and `.csi` formats, and the bgzip compression utility.
+
+[1]: http://samtools.github.io/hts-specs/
+[2]: http://samtools.github.io/bcftools/
+[3]: http://github.com/samtools/samtools
+[4]: http://zlib.net/