ASE stuff
Bug fix calculating maf and filtering samples
Minor
ASE output samples supporting ASE
added sample support to tests
Added test for sample support ASE
Fixed bug VCF phasing
Improved intergration of new VCF reader

Including automapping of of probs, dosage and genotypes depending on
avalible fields
Fix VCF
eQTL building process
Merge pull request #264 from PatrickDeelen/master

eQTL building, ASE, Genotype IO