Merge pull request #265 from dshrader/master

Update docs with changes that happened in rc4
Changed version to 2.4
Merge pull request #268 from agtorre/master

Changed version number
Updated ChangeLog to include feature updates and additions
Updated ChangeLog format
Merge pull request #270 from thewacokid/master

Updated ChangeLog for 2.4 release
Update README documentation

* Add a "What's New" section to point folks to the Changelog file
* Update regression suite information on where to get it and how to use
  it