htslib: Remove razf

razf has been removed in HEAD. See
https://github.com/samtools/htslib/pull/74
htslib: Conflicts with tabix

Both htslib and tabix install bin/tabix
htslib: Add a test
samtools: Do not build razip

razip has been removed upstream. See
https://github.com/samtools/htslib/pull/74
samtools: Fix a typo. Htslib should be htslib
samtools: 0.2.0-rc8 devel