cookbook

I found several useful applications of pseudo-random number sampling in the past. In particular:

• Inverse transform sampling
• Gibbs sampling

(This issue serves a reminder to add the respective methods. Pull requests always welcome.)

Add documentation about how to bind multiple instances of the same query parameter to a slice.
Use this UT as a reference (if it is possible make a more real example than this 😉)

func TestBindSlices(t *testing.T) {
	e := New()
	req := httptest.NewRequest(GET, "/?str=foo&str=bar&str=foobar", nil)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)
	result := struct {