Updates parseSample to permit truncated sample values, containing

[carbocation]

Updates parseSample to permit truncated sample values, containing fewer entries than the FORMAT fields. This is permitted by the VCF 4.2 spec. It is present "in the wild" in VCFs that were produced by GATK from gVCFs. Specifically, this fixes #16

[coveralls]

Coverage decreased (-0.1%) to 66.968% when pulling d5dc8a6 on carbocation:feature/permit-shorter-sample-filters into 654ed2e on brentp:master.

[brentp]

Looks reasonable. Can you add a test-case (and possibly a test-vcf?)

[carbocation]

The demo VCF given at internationalgenome.org actually has an example of this (where a haplotype quality flag ["HQ"] is only given for phased calls, and one of the calls is not phased). Adding this as a note-to-self since I still haven't put together a test, initially due to lack of public example VCF. This solves that; now I just need to assemble it.