Error codes for SPARQL

[http://astro.pip.verisignlabs.com/]

all errors in parsing (like prefix not found etc) throw a genaric HTTPError with error code 400.

These should be turned into the relevent python exception classes for both sesame and joseki error pages should be using

class MalformedQueryError(SPARQLError):
    """Query Syntax Error for SPARQL RDQL etc"""

class QueryEvaluationError(SPARQLError):
    """Query Evaluation Error reported by Server"""

errors

[http://openvest.myopenid.com/]

Status is set to worksforme. Made changes to get the proper return for Sesame and jena.

Tickets for this should now be submitted with exact query and endpoint being used.