missing position variable should be start/end
fix readme example
fix exons and transcripts properties on Gene
Merge pull request #12 from hammerlab/gene-properties

Fix exons and transcripts properties on Gene
Merge pull request #11 from hammerlab/readme-fix

Fix readme example
Merge pull request #10 from hammerlab/fix-pos-error-message

Missing position variable should be start/end
merge and version bump