[WIP] working on massive changes for v1.0
running go fmt
redoing static file serving
rewriting Session stuff as a helper not a middleware
MockResponseWriter -> BufferedResponseWriter
adding BufferedResponseWriter#Flush(), and a rapped response_writer
adding comments
adding Session#Del
rewriting examples to use new way of doing things
adding an example with multiple middlewares
fixing sessions benchmark
making Static take an http.FileSystem
updating the readme