Add line numbers from template to view.

I think just a case of passing line as an option to `EEx.compile_`

There are some issues with generating a single AST from multiple templates, i.e. wrapping the layout.
Here is some experiments https://github.com/CrowdHailer/raxx/commit/db747cb73f30a00aa4a392faf08f0b15ebb5d643