Update README.md

Added demo video link
Allow handlers to return a status code
Don't use the first value as a status code if not an integer
fixed serving default `index.html`

See [net/http](http://golang.org/src/pkg/net/http/fs.go#L314)
Added a martini.ResponseWriter interface to make wrapping easier
feat: Add http verb PATCH to router
Remove filepath join
docs: Add `PATCH` documentation to README
Merge branch '67-patch-method' of github.com:cgarvis/martini into cgarvis-67-patch-method
Added support for http.Hijacker interface
Merge pull request #71 from codegangsta/JMS-ResponseWriter

Added a martini.ResponseWriter interface to make wrapping easier
adding documentation
more
Merge pull request #74 from runemadsen/master

Adding a bit of documentation
Merge pull request #64 from noonat/hijack

Added support for http.Hijacker interface
JMS #62: Implemented Handlers. Need docs and tests
JMS #62: Handlers test
JMS #62: Documenting Handlers in the readme
JMS #62: Godoc documentation
Merge pull request #77 from codegangsta/JMS-62

Implemented Handlers function to replace all middleware