Remove deprecated plusOrMinus syntax
Drop Specs trait, which has been deprecated since 2.0 release,
one year ago.
Merge branch 'remove-deprecated-specs' of https://github.com/gulaputih/scalatest into 2.2.x
Merge branch '2.2.x' of https://github.com/scalatest/scalatest
Bringing in the plusOrMinus and Specs deprecations from 2.2.x into master.