X-axis is zero-fixed

[thoemel]

xaxis.min seems to be set to zero. This looks nasty when using time series. Can you detect the best min value for the xaxis?

You can see what I mean by feeding your example with this data:

data.push({
    data: [[1388530800000,102.406],[1391209200000,165.44],[1393628400000,223.588],[1396303200000,null],[1398895200000,null],[1401573600000,null],[1404165600000,null],[1406844000000,null],[1409522400000,null],[1412114400000,null],[1414796400000,null],[1417388400000,null]]
});

data.push({
    data: [[1388530800000,null],[1391209200000,null],[1393628400000,null],[1396303200000,null],[1398895200000,115.734],[1401573600000,609.038],[1404165600000,667.849],[1406844000000,559.338],[1409522400000,319.527],[1412114400000,221.966],[1414796400000,82.8976],[1417388400000,136.818]]
});