Support piping code with PHP open tag
Remove superfluous parameter for deserialize()

deserialize() only takes one argument: the stream. This seems to be a
refactoring leftover.
Adapt unittests
Merge pull request #366 from kiesel/fix-responsereader

Fix invocation of RestDeserializer
- Invoke htmlspecialchars() w/ fixed encoding

PHP defaults differ through the versions:
  . <= 5.3 uses iso-8859-1
  . 5.4, 5.5 uses utf-8
  . 5.6 uses "default_encoding"
Merge pull request #367 from kiesel/fix/htmlspecialchars

- Invoke htmlspecialchars() w/ fixed encoding
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