Update README.md
Add a temp script with a small range selection example
Merge branch 'master' of https://github.com/Paradigm4/vcf_tools
Adds a script that queries the GVCFs by region.
Tweaking the gvcf chunking size.

The requirement here is that both the cross_join works, the load doesn't take too long (~1.5 m on a single GVCF).  There was also another error mode about the chunk size being too small, which we're avoiding here as well.
Adding separate files for updating chroms/samples.
Removing the multi-applies from convert.iquery