Progressive image generation
Added: prog into options and readme.
Fixed: pep8.
Add progressive tests and consistency changes

* Renamed expected test files
* Added progressive command line option
* Added progressive error type
* Renamed prog command line argument to progressive
* Modified generated expected to make a progressive test
Merge branch 'dotpot-feat/progressive-image-generation'

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Fix for unordered dict bug in image tests
Version 1.0.4

* Add progressive option
Add symlinks to old example paths
Change example symlinks to hard copies
Add prog to documentation for rotate and region
Expand test coverage