[IO-361] Add API FileUtils.forceMkdirsParent().

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@1423916 13f79535-47bb-0310-9956-ffa450edef68
[IO-362] IOUtils.contentEquals* methods returns false if input1 == input2, should return true.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@1428941 13f79535-47bb-0310-9956-ffa450edef68