Set up RSpec.

--HG--
rename : test/unit/compile/extension/axs_test.rb => spec/compile/extension/axs_spec.rb
rename : test/unit/compile/extension_discovery_test.rb => spec/compile/extension_discovery_spec.rb
rename : test/unit/compile/extension_handler_test.rb => spec/compile/extension_handler_spec.rb
rename : test/unit/compile/script_test.rb => spec/compile/script_spec.rb
rename : test/unit/compiler_result_test.rb => spec/compiler_result_spec.rb
rename : test/unit/compiler_test.rb => spec/compiler_spec.rb
rename : test/unit/source_file_test.rb => spec/source_file_spec.rb
rename : test/unit/workspace/extension/axs/axs-file.axs => spec/workspace/extension/axs/axs-file.axs
rename : test/unit/workspace/import-test/compiler-errors.axs => spec/workspace/import-test/compiler-errors.axs
rename : test/unit/workspace/import-test/compiler-result1.axs => spec/workspace/import-test/compiler-result1.axs
rename : test/unit/workspace/import-test/compiler-result2.axs => spec/workspace/import-test/compiler-result2.axs
rename : test/unit/workspace/import-test/duet-module/duet-lib-pjlink_dr0_1_1.jar => spec/workspace/import-test/duet-module/duet-lib-pjlink_dr0_1_1.jar
rename : test/unit/workspace/import-test/import-test.apw => spec/workspace/import-test/import-test.apw
rename : test/unit/workspace/import-test/import-test.axs => spec/workspace/import-test/import-test.axs
rename : test/unit/workspace/import-test/include/import-include.axi => spec/workspace/import-test/include/import-include.axi
rename : test/unit/workspace/import-test/module-compiled/test-module-compiled.axs => spec/workspace/import-test/module-compiled/test-module-compiled.axs
rename : test/unit/workspace/import-test/module-source/test-module-source.axs => spec/workspace/import-test/module-source/test-module-source.axs
rename : test/unit/workspace/import-test/source-file-include.axs => spec/workspace/import-test/source-file-include.axs
rename : test/unit/workspace/import-test/source-file-library.axs => spec/workspace/import-test/source-file-library.axs
rename : test/unit/workspace/import-test/source-file-module.axs => spec/workspace/import-test/source-file-module.axs
rename : test/unit/workspace/import-test/source-file-plain.axs => spec/workspace/import-test/source-file-plain.axs
rename : test/unit/workspace/script/script.axs => spec/workspace/script/script.axs
Converted compiler_result_spec to rspec.
Converted script_spec to rspec.
Converted extension_handler_spec to rspec.
Converted extension_discovery_spec to rspec.
Converted axs_spec to rspec.
Converted compiler_result_spec to rspec.
Converted source_file_spec to rspec.
Converted compiler_spec to rspec.
Converted MockCompilable to rspec.
Converted TestFileGenerator to rspec.