9.0.0: XP9 Compatibility

• Merged PR #3: XP9 Compat. Heads up: xml.Tree, xml.Node, xml.CData and
  xml.PCData now implement lang.Value instead of extending lang.Object.
  (@thekid)

8.0.2: Refactor typeof()

• Refactored code to use typeof() instead of xp::typeOf(), see
  xp-framework/rfc#323
  (@thekid)

8.0.1: Code QA

• Code QA (no functional changes!) - @thekid

8.0.0: Drop PHP 5.5

• Improved speed of XSL callbacks by using direct invocations instead
  of call_user_func_array / func_get_args indirection
  (@thekid)
• Heads up: Dropped PHP 5.5 support! - @thekid
• Added forward compatibility with XP 8.0.0
  (@thekid)

7.0.1: Node naming fix

• Merged pull request #2: Updated obsolete PHP namespace seperator...
  (@djuelg, @kiesel)

7.0.0: XP7 compatibility

• Adopted semantic versioning. See xp-framework/rfc#300 - @thekid
• Added version compatibility with XP 7 - @thekid

6.3.1: XP7 Forward compatibility

• Fix code to use nameof() instead of the deprecated getClassName()
  method from lang.Generic. See xp-framework/core#120
  (@thekid)

6.3.0: Welcome XP 6.5, PHP 5.5, HHVM

• Heads up: Dropped PHP 5.4 support. Note: As the main source is not
  touched, unofficial PHP 5.4 support is still available though not tested
  with Travis-CI.
  (@thekid)
• Officially addited support for HHVM (3.5+) support - @thekid

6.2.2: Path to PHP7

• Rewrote code to ue literal() instead of xp::reflect(). See
  xp-framework/rfc#298
  (@thekid)

6.2.1: Forward compatibility

• Added forward compatibility with XP 6.4.0
  . Rewrote code using create() to PHP 5.4 syntax
  . Replaced raise() with throw statement
  (@thekid)