0.90.3 – All at the same time

Changes:

• In pedantic mode check that xml/xmlns are not used as names (they
  are always invalid). Note that namespaces can be specified using
  @XmlSerialName (for tags) and @XmlNamespaceDeclSpec (for
  additional names).
• The cache to use can now be configured. By default it uses the
  threadLocal version, but the thread unsafe default is also available,
  as is the FormatCache.Dummy cache that does no caching.

Fixes:

• Fix support for multiple namespaces inside a single tag (QNameMap)
  as reported in #249.
• Use threadlocals for caching document structures by default. This should avoid
  multithreading issues when reusing the format (recommended for speed)