Abillity for href to open/render another view/template

Something like that:

```
"templates": {
"body": {
"sections": [
{
"items": {
"{{#each $jason}}": {
"type": "label",
"text": "{{article.title}}",
"href": {
"param-to-pass-data": "{{article}}",
"template": "article",
"view": "jason"
}
}
}
},
]
},
"article": {...}

```
It would display another view in a push transition. Data can be passed.

My use case behind: I have everything I need in the first $network.request (a json with a list of articles, with their body). So I don't need extra http call, etc.

[First talk was on slack.](https://jasonette.slack.com/archives/general/p1479066616003625) Need discussion.

Start with the issue description and the linked Slack discussion, then locate the code paths that handle href actions and template/view navigation. No files, tests, or entry points are named in the issue. The work is done when the proposed navigation behavior, data passing, transition, and expected configuration are agreed and implemented.

Written by the indexing model from the issue text.