1.5.1

* Drop custom NumberNode/ArrayNode/ObjectNode implementations, use Guava's
  Equivalence instead; this makes the code much more robust.

Francis Galiegue (17):
      Remove .asMap() method from custom ObjectNode implementations
      Announce 1.4.2
      Fix some javadoc links
      Provide an override of ObjectNode and ArrayNode
      Javadoc updates
      Minor code changes
      Announce 1.4.3
      Add new Google group
      README.markdown updates
      Implement JsonNode equivalence using Guava's Equivalence
      EnumSyntaxChecker: use the new equivalence
      EnumKeywordValidator: use the new equivalence
      UniqueItemsKeywordValidator: use the new equivalence
      JacksonUtils: provide a node factory, a mapper and an empty object node
      Replace all usages of CustomJsonNodeFactory with JacksonUtils' new methods
      Get rid of CustomJsonNodeFactory and associated classes
      Javadoc updates

Signed-off-by: Francis Galiegue <fgaliegue@gmail.com>