Add Reader versions of InfinispanConfiguration factory methods

'Tis a bit awkward/inefficient to parse an Infinispan configuration from a string.
Currently, I would have to do something like:

InfinispanConfiguration.newInfinispanConfiguration(new ByteArrayInputStream(config.getBytes()));

Since we're expecting character data anyway, it would be nice to add reader versions of the factory methods to the api, e.g.
InfinispanConfiguration.newInfinispanConfiguration(Reader reader)

That way, I can do:

InfinispanConfiguration.newInfinispanConfiguration(new StringReader(config));

The InputStream factory methods can then delegate to the Reader factory methods via InputStreamReader.