Added .dir-locals.el to set the line width for automatic text wrapping
in Emacs.
Instruction: Made #valid? be a public method as originally intended.
The 'be_valid' matcher in RSpec 2.x was hiding this mistake from us.
Got the tests to pass with both rspec 2.99 and 3.0.0 (but not the
latest version of MPLAB X.  Also, I want to make 'rake multispec' test
out RSpec 2.x but haven't figured out how to yet.
Added spec/rspec_runner.rb, a script for running particular versions
of RSpec.
Improved rspec_runner.rb so it takes a requirement spec.
Made rake multispec test a variety of RSpec versions,
fixed something in sim_diagnostics.rb as a result.