Merge pull request #2 from chapmanb/master

Parse VCF with haploid calls, all no-call variants and incorrect header information
0.1.3: allow unknown QUAL
v0.1.4: add gt_depth attribute
handle unknown genotype depths as -1
move to 0.1.5
add support for genotype quals, and ref and alt depths
Fixes for build issues from pypi: include ez_setup and build *.c files as part of distribution. Bump version to 0.1.7