Merge pull request #6 from cleandart/feature/request

we know have different request
Copying StaticFileHandler
Cleaning up
Removing unnecessarry features
Implementing basic use case with test
Writing test for headers and not found
Testing range
Merge pull request #7 from cleandart/feature/static-file-handler

Feature/static file handler
Merge branch 'master' into feature/cookies

Conflicts:
	test/backend_test.dart