Added ability to specify image transformations

[mak001]

• relies on salsify to transform the images

Resolves #36

[codecov]

Codecov Report

Merging #73 into master will increase coverage by 1.41%.
The diff coverage is 30.76%.

@@             Coverage Diff              @@
##             master      #73      +/-   ##
============================================
+ Coverage     51.07%   52.49%   +1.41%     
+ Complexity      346      331      -15     
============================================
  Files            19       19              
  Lines           836      823      -13     
============================================
+ Hits            427      432       +5     
+ Misses          409      391      -18     

Flag	Coverage Δ	Complexity Δ
#php	52.49% <30.76%> (+1.41%)	331.00 <11.00> (-15.00)	⬆️

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Impacted Files	Coverage Δ	Complexity Δ
src/ORM/AssetFormFactoryExtension.php	0.00% <0.00%> (ø)	4.00 <0.00> (ø)
src/TypeHandler/Asset/ImageHandler.php	71.73% <23.07%> (+26.02%)	13.00 <3.00> (-20.00)	⬆️
src/TypeHandler/Asset/AssetHandler.php	54.16% <41.66%> (-3.73%)	16.00 <8.00> (+5.00)	⬇️

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[muskie9]

Looks great! One typo in the readme, and one suggestion for isTransformOutOfDate(). The latter just cuts down on lines and doesn't necessarily have to be implemented.