Added CocoaHTTPServer source files.
Added CocoaHTTPServer upstream source files.
Implemented basic SPARQL endpoint using CocoaHTTPServer.
Replace blanks with variables earlier in the query planning process.
Add joinPlanForPlans:and: method to the GTWQueryPlanner protocol (used by custom query planners).
Fixed typo in GTWSPARQLResultsXMLSerializer serialization of typed literals.
Updated LICENSE.md.
Updated xcode files.