Added basic support for wormtable backend.
Added support for searching on variantName
Support for variantSets and callSets.
Fixed phaseset bug.
Updates README with wormtable backend.
Updated simulator to compare with wt backend.
Improved comments and documentation.
Fixed pep8 formatting issue.
Merge pull request #9 from jeromekelleher/wormtable-variants

Wormtable backend to serve variants from VCF