Make imageView public so subclasses can use it

[jeffoleary1987]

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@deb2cb3). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #167   +/-   ##
=========================================
  Coverage          ?   93.42%           
=========================================
  Files             ?       39           
  Lines             ?     4107           
  Branches          ?      333           
=========================================
  Hits              ?     3837           
  Misses            ?      269           
  Partials          ?        1

Impacted Files	Coverage Δ
Source/Bricks/Image/ImageBrick.swift	78.32% <ø> (ø)

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