Fix foreach block for vcf ingest
Merge pull request #494 from kyocum/fixVcfIngest

Fix foreach block for vcf ingest
Creating RegionRDDFunctions

helper functions for RDD[ReferenceRegion] and RDD[(ReferenceRegion, T)]
Finished basic implementations of joinByOverlap and filterWithinRange
Revising the list of methods

Adding the join/filter/group methods for each of Overlap/WithinRange
wip added windowCounts method.