route_param and dot in parameter

Parameters captured by `route_param` can't contain dots.

For example, route '/:name'

```
params requires => { name => "name", type => Str };
route_param 'name' => sub {
    get sub {
        [ "hello" => shift->{name} ]
    }
}
```

This is ok

```
$ curl 'http://0:5000/username'
["hello" : "username"]
```

but this isn't

```
$ curl 'http://0:5000/user.name'
Nothing found
```
