Allow to generate multiple files from one, and automatically define locals

[alem0lars]

Allow to generate multiple files from one, and automatically define locals.

---

Expected behavior

For example, it should be possible to do:

<% get_var!(:"wireless.interface").each do |interface| %>
  - src:  wpa_supplicant\.conf$
    dst:  /etc/wpa_supplicant/wpa_supplicant-<%= interface %>.conf
    only: f?wpa_supplicant
<% end %>

Having automatically defined a local named interface with the right value (every time the template is evaluated, it has the right interface value).

Actual behavior

This issue is an enhancement to the current behaviour, that doesn't correctly handle that kind of situations.

Steps to reproduce the problem

Always

Version

Include the output of fizzy version. Here's an example:

$ fizzy version
☞ fizzy version 2.2.0
☞ ruby version ruby 2.4.0p-1

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