OOM on malformed input

[fhars]

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scala> import scala.xml.pull._
import scala.xml.pull._

scala> import scala.io.Source
import scala.io.Source

scala> val r = new XMLEventReader(Source.fromString("<broken attribute='is truncated") )
[error] (XMLEventReader) java.lang.OutOfMemoryError: Java heap space

ch returns 0.asInstancsOf[Char] every time it is called, while MarkupParserCommon.xAttributeValue loops until ch returns endCh, happily appending all the zeros to its internal string buffer.

[som-snytt]

Fixed by #44 ?