ModeShape should close the supplied input streams when importing XML

According to the JavaDoc for these methods, these methods are responsible for closing the input stream supplied as a parameter:

• Node.setProperty(String, InputStream)
• Property.setValue(InputStream)
• ValueFactory.createValue(InputStream)
• ValueFactory.createBinary(InputStream)
• Session.importXML(String, InputStream, int)
• Workspace.importXML(String, InputStream, int)

(Note that the JSR-283 specification doesn't appear to require this.)

ModeShape's implementation of all of these methods do close the stream, except for the two "importXML" methods. This needs to be corrected.