Merge pull request #17 from mongodb-js/0.0.0-preview.7 0.0.0-preview.7

0.0.0-preview.6 

0.0.0-preview.5 

0.0.0-preview.4 0.0.0-preview.4

0.0.0-preview.3 (#8) 

0.0.0-preview.2 0.0.0-preview.2

0.0.0-preview.1 

0.0.0-preview.0