Document URI's not formatted correctly in RDF/XML format

For example, the generated document namespace for java-spdx-tagvalue-store version 1.6:

```
http://spdx.org/documents/java-spdx-tagvalue-store-%7B$version%7D
```

It should be:

```
http://spdx.org/documents/java-spdx-tagvalue-store-1.1.7
```