Log Message:
apache-ivy: Update to 2.5.0

Changelog for 2.5.0:
  - The minimum runtime Java version required is now Java 7
  - Ivy now uses BouncyCastle OpenPGP API 1.59. Due to the non backward
    compatibility of that library, earlier versions are not supported.
  - Ivy now uses HttpComponents HttpClient 4.5.x version with HTTP backed
    resolvers. Users are expected to have this version of the library (and its
    dependencies) in their runtime classpath if they want to use such
    resolvers.
  - The previous (similarly named but not the same) commons-httpclient library
    is no longer used or supported.

For full changelog see:
http://ant.apache.org/ivy/history/2.5.0/release-notes.html