Removing extension-files file
Do createImageData/putImageData in chunks, to save memory.
Extracts evaluator preprocessor and refactor text extraction
Merge pull request #4119 from yurydelendik/preprocessor

Extracts evaluator preprocessor, refactor text extraction and paintFormXObject
Remove old CSS rules
Merge pull request #4142 from Snuffleupagus/css-cleanup

Remove old CSS rules
Merge pull request #4138 from nnethercote/chunk-ImageData

Do createImageData/putImageData in chunks, to save memory.
Merge pull request #4136 from timvandermeij/remove-extension-files

Removing extension-files file