rest.api should for route /sensor/:id should take metric type into account

[do3meli]

the route /sensor/:id in rest.php is currently only taking the id attribute into account:

$app->get('/sensor/:id', function($id) use ($app) { 
$res=getSensorById($id); 
$app->render(200,o2h($res)); 
}); 

actually this can lead to a problem if one does have two or more metric types availalbe at 1 single sensor. for example the call to http://home.dominicschlegel.ch/api/sensor/26.A1E97B000000 is only returning 1 row but i have to sensor at this id.

my suggestion is to change the route to /sensor/:id/:metric. this would allow to use the metric value for the lookup by getSensorById:

$app->get('/sensor/:id/:metric', function($id,$metric) use ($app) { 
$res=getSensorById($id,$metric); 
$app->render(200,o2h($res)); 
});