Support permanent link to share a result with other people

[aidy1991]

When we use ChainerUI in order to share results of training in our team, we need permanent link feature to share a result in the same graph condition. (Maybe this is also useful to share with oneself after some days or some weeks)

For example, the permanent link should include:

• which metrics is selected as each axis
• which results are selected
  and so on...

(ChainerUI has a lot of parameters to show a graph of results, so is it difficult to design permanent link?)