Merge pull request #6 from erwinwinder/master

Added Ped/Map
Updated minor allele freq for SNPs + lots more tests
Merge pull request #7 from erwinwinder/master

 	PedMap, major refactorings
Merge pull request #8 from erwinwinder/master

 	Fixed bug what is snp
resolve conflict
Merge pull request #9 from erwinwinder/master

Reintroduce SnpGeneticVariant, New caching system
Merge branch 'master' of https://github.com/molgenis/molgenis-genotype-reader
Update getSnpVariantsByPos to only return one snpGeneticVariant

Only one SNP per pos posible so returning this as snpGeneticVariant
Updated gitignore
Function name fix
Convenience function to get SNP by ID
Merge pull request #10 from PatrickDeelen/master

Few functions to work with SNPs
Ped/map writer
Swap alleles