Add data migration to convert Result.in_dbsnp nulls to False

Signed-off-by: Don Naegely <naegelyd@gmail.com>
Convert Result.in_dbsnp to BooleanField(default=False) and add index

Signed-off-by: Don Naegely <naegelyd@gmail.com>
Use False instead of null for in_dbsnp when processing result lines

Signed-off-by: Don Naegely <naegelyd@gmail.com>
Merge pull request #22 from cbmi/issue-20

Remove nullable option from and add index to Result.in_dbsnp