store upSkip position before skipping
refactoring: move rfdraw and getAutoBBox to koptcontext module
add optimizing functionality ('copy' mode in k2pdfopt)
specify bmp source when calling getTOCRWord
specify bmp source when calling getNativeWordBoxes and getReflowedWordBoxes
Merge pull request #146 from chrox/master

add optimizing functionality ('copy' mode in k2pdfopt)