Finished the should equal tolerance tests and functionality


git-svn-id: http://scalatest.googlecode.com/svn/trunk@4771 fd1274fd-080f-5963-8033-43ee40fcd1de
Include the word "equal" in the error message for ===


git-svn-id: http://scalatest.googlecode.com/svn/trunk@4772 fd1274fd-080f-5963-8033-43ee40fcd1de