Require npm >=1.3.7
Require npm >=1.3.7

Using tilde version ranges necessitates npm >=1.3.7 (npm@f369647b).
Make this dependency explicit in case anyone tries to use the module on
old npm versions.

Signed-off-by: Kevin Locke <ffb4761cba839470133bee36aeb139f58d7dbaa9@kevinlocke.name>

kevinoid/stream-compare,kevinoid/travis-status,kevinoid/git-branch-is,kevinoid/stream-compare,kevinoid/git-branch-is,kevinoid/promised-read,kevinoid/node-project-template,kevinoid/stream-compare,kevinoid/node-project-template,kevinoid/appveyor-status,kevinoid/appveyor-status,kevinoid/swagger-spec-validator,kevinoid/promised-read,kevinoid/travis-status,kevinoid/node-project-template,kevinoid/appveyor-status,kevinoid/promised-read,kevinoid/swagger-spec-validator,kevinoid/swagger-spec-validator,kevinoid/git-branch-is,kevinoid/travis-status