Update variant usage to the latest API
Update 1kg dataset id
Structure demo code into an R package.
Add license headers.
Merge pull request #7 from siddharthab/package

Structure demo code into an R package.
Update README.rst
Fix Roxygen params.
Update 1kg readset id
Added API key authentication
Added integration tests for variants
NAMESPACE file cleanup
Merge pull request #8 from siddharthab/master

API key auth and integration tests