Enable Jena Fuseki SPARQL as service on Travis

Runs Jena Fuseki SPARQL 1.0.2 as service.

It will currently return an error because `JSON` is expected as default ("&output=xml" to $parameterString in the doQuery function) [0].

```
1) SMW\Tests\Integration\QuerySourceIntegrationTest::testQueryRoutingWithDefaultSource
SMWSparqlDatabaseError: A SPARQL query error has occurred
Query: PREFIX wiki: <http://example.org/id/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX swivt: <http://semantic-mediawiki.org/swivt/1.0#>
PREFIX property: <http://example.org/id/Property-3A>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
SELECT DISTINCT ?result WHERE {
?result swivt:page ?url .

}
OFFSET 
LIMIT 1
Error: Malformed query
Endpoint: http://localhost:3030/db/query
HTTP response code: 400
```

But Travis sucessfully runs the service with SPARQL queries like:
```
20:45:20 INFO  [8261] exec/select
20:45:20 INFO  [8261] 200 OK (1 ms) 
20:45:20 INFO  [8262] POST http://localhost:3030/db/query
20:45:20 INFO  [8262] Query = PREFIX wiki: <http://example.org/id/> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX swivt: <http://semantic-mediawiki.org/swivt/1.0#> PREFIX property: <http://example.org/id/Property-3A> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> SELECT * WHERE { swivt:page swivt:wikiPageSortKey ?s  OPTIONAL { swivt:page swivt:redirectsTo ?r } } LIMIT 1
20:45:20 INFO  [8262] exec/select
20:45:20 INFO  [8262] 200 OK (1 ms) 
20:45:20 INFO  [8263] POST http://localhost:3030/db/query
```

For the first time it will be possible to actually test [1] the `SMWSparqlDatabase` implementation.

[0] http://semantic-mediawiki.org/wiki/Help:Using_SPARQL_and_RDF_stores#Jena_Fuseki
[1] https://api.travis-ci.org/jobs/27900842/log.txt?deansi=true