SPARQL/Update query-types

[indeyets]

Right now, 3 query-types for SPARQL/Update are defined: INSERT, DELETE, MODIFY and query-type is detected via regular expression.

The problem is, that there is no MODIFY keyword in SPARQL/Update grammer as modify query is defined as ( 'WITH' iri )? ( DeleteClause InsertClause? | InsertClause ) UsingClause* 'WHERE' GroupGraphPattern.

On the other hand, there is a bunch of query-types unknown to SPARQLWrapper (LOAD, CLEAR, DROP, etc.)

[wikier]

The unknown query types have been fixed with pull #29.

I'll take a look how to fix the regex that does the query type detection to support the new modify syntax.

[wikier]

@indeyets any test that we could add to warranty this fix?

[indeyets]

@wikier can't think of anything which would make sense in terms of current implementation. it's ok to close it.