bug with sql2 samenode query when path contains spaces

If there is a path in ISSAMENODE and other such queries, SQL2 parsing fails because the tokenizer splits on the spaces and the parser does not expect that. see also the code in parseLiteral for how strings are handled correctly.

```
SELECT * FROM [nt:file] AS file WHERE ISSAMENODE(file, ["/home node"])
```

see also https://github.com/phpcr/phpcr-api-tests/issues/116
