add support for lazy-loading tiled images

[chrstphrbrns]

Fixes #164

[tlnagy]

Hi Chris, thanks for tackling #164, but I'm not sure if this is the best approach. The Matrix(transform(...) call is a major allocation on access. Why is this necessary to fix lazy loading tiles?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.67%. Comparing base (1eec9cf) to head (5633714).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #165   +/-   ##
=======================================
  Coverage   93.67%   93.67%           
=======================================
  Files          13       13           
  Lines        1122     1122           
=======================================
  Hits         1051     1051           
  Misses         71       71           

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