aplus: disable X
Stop caching Superenv.bin

It is not a hotspot and causes an ordering dependency in the tests.
Remove ruby-prof rake task

The areas that we are interested in optimizing for performance are
things that are invoked repeatedly, and are not evident in the test
suite.
Remove rcov rake task

rcov is not compatible with Ruby 2.0.
aplus: --without-x doesn't work
lynis 1.5.5
lynis: add 1.5.5 bottle.