Fixed PIL size bug in ImageRecordComponent (#889)

[nicjac]

Fixed how image size is returned for PIL image objects in ImageRecordComponent

Closes #889

[codecov]

Codecov Report

Merging #894 (1167e37) into master (0088ad2) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##           master     #894   +/-   ##
=======================================
  Coverage   87.62%   87.62%           
=======================================
  Files         232      232           
  Lines        4994     4994           
=======================================
  Hits         4376     4376           
  Misses        618      618           

Flag	Coverage Δ
unittests	87.62% <50.00%> (ø)

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Impacted Files	Coverage Δ
icevision/core/record_components.py	81.48% <50.00%> (ø)

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