v1.0.1: A few issue fixes

Response headers were still being sent even after the Response->respond() method was called.
Problem: It was causing an error if using echo in the user code.
Solution: Updated Response->respond() method to exit after the response is sent causing the execution to end immidieately for a given request.

Some servers are not supporting HTTP Methods except for GET and POST
Problem: Need a way to send PUT, PATCH and DELETE as they are commonly used Http Methods
Solution: Supported a header X-HTTP-METHOD-OVERRIDE whose value can be the HTTP method you need to send. This can be achieved using http POST request too.# On branch master