Clean up 'test' directory

deleted:    test/OLD/ALL_test.rb
deleted:    test/OLD/FoxCalc_test_old.rb
deleted:    test/OLD/Loop_test.rb
deleted:    test/OLD/Word_test.rb
deleted:    test/OLD/runner.rb
deleted:    test/OLD/test_FormalSum.rb
deleted:    test/OLD/test_FoxCalc.rb
deleted:    test/OLD/test_FreeGroup.rb
deleted:    test/StdMagnusExp_spec.rb
deleted:    test/SympMagnusExp_spec.rb
Merge branch 'experimental' of https://github.com/yamryo/GLA into experimental
Upgrade Guardfile with new format for guard-rspec
Brush up multiplication methods
Make Terms, LieBrackets be able to use Rational coefficients
Refine the regexp used in Term#initialize (still have errors)
Finish cleaning Term#initialize and we have no errors in test

 Changes to be committed:
	modified:   src/Term.rb
	modified:   test/Term_spec.rb
	modified:   test/Word_spec.rb
Clean the all files up before merging with master
Merge branch 'experimental' of git://github.com/yamryo/GLA into experimental