Merge branch 'master' of https://github.com/yamryo/GLA
Merge branch 'experimental'
deleted:    src/StdMagnusExp.rb
deleted:    src/SympMagnusExp.rb
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