Confine Kernel#exec call to bin/splot
Correctly call --name= in TESTOPTS
Test cleanup
Whitespace
Move requires to lib/splot.rb
Gracefully exit binary when test file not found
Enable passing non test file for automagicness

Example: splot -f app/models/user.rb will run test/models/user_test.rb
(or spec/models/user_spec.rb)