Move core libraries around.

 On branch exp_env_loading
	modified:   index.js
	renamed:    lib/command_factory.js -> lib/enginemill/command_factory.js
	renamed:    lib/commands/console.js -> lib/enginemill/commands/console.js
	renamed:    lib/commands/help.js -> lib/enginemill/commands/help.js
	renamed:    lib/commands/run.js -> lib/enginemill/commands/run.js
	renamed:    lib/commands_factory.js -> lib/enginemill/commands_factory.js
	renamed:    lib/enginemill_environment.js -> lib/enginemill/environment.js
	renamed:    lib/enginemill_process.js -> lib/enginemill/process.js
	renamed:    lib/repl.js -> lib/enginemill/repl.js
	renamed:    lib/expected_globals.js -> lib/library/expected_globals.js
	renamed:    lib/http.js -> lib/library/http.js
	renamed:    lib/index.js -> lib/library/index.js
	modified:   test/executable_test.js
	modified:   test/http_test.js
	modified:   test/settings_test.js
	modified:   test/utilities_test.js