Updated data-manager

Improved reliability of fetching all instances of drivers
Externalised Express main logic to app.js

And server.js now accepts a PORT as argv
Stop throwing empty_graph exceptions
Updated data-manager

* Fixed reliability issues of fetching
* DriverSparqlStream now extends events,EventEmitter instead of
stream.Transform
* DriverSparqlStream objects are now stored globally like driverObject
Removed GitHub button
Updated view for Place
Updated view for qb:DataSet
Decoupled search API
Updated stylesheet
Minor refactor search API
Decoupled datasetsPublishedBy logic
Updated dataset view
Added ORG to context and linted shared.js