<context> - Fix context when there are 2 top level components

[ccinelli]

Scope

This connect 2 top level components through a channel.

Description

Fix #15, and #12 even if not by path.

Motivation and Context

Communication between top level components.

Checklist:

• I have updated/added documentation affected by my changes.
• I have added tests to cover my changes.

[jsf-clabot]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #16 (b7bf3c0) into master (3dbec36) will decrease coverage by 3.24%.
The diff coverage is 81.25%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
- Coverage   94.91%   91.66%   -3.25%     
==========================================
  Files           3        3              
  Lines          59       72      +13     
==========================================
+ Hits           56       66      +10     
- Misses          3        6       +3     

Impacted Files	Coverage Δ
tags/context/src/helpers.js	87.50% <70.00%> (-12.50%)	⬇️
tags/context/src/components/context/transformer.js	93.33% <100.00%> (+1.66%)	⬆️

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