“SpaDoc” format returned from NodeJS
Add page offsets
Collapse sentence and word tokenisers 

Usage example
node document_parser.js --noparse --input ../../../examples/TestDocument1.pdf -o TestDocument1.base64
node document_parser.js --base64 --input TestDocument1.base64 --output TestDocument1.json 
python document_tokenizer.py TestDocument1.json
Working SpaDoc style sentence tokenizer