Added some npm install polish

Added an index.js file to export lib/sansa.js to those who require('sansa')
Added exports.connect to expose connectors to supported JSON stores
Added exports.connect.fs for let sansa connect to the file system as a JSON store
Added some Jasmine tests to verify that sansa-fs got exported properly
Modified package.json to run 'cake compile' as a post-install script
Updated the version number in package.json