XREF parser bug fix - Fix when an old version of an object was being …

…used instead of the updated version

fix: setting sourceFile on the reader when importing streams

fixes a bug where it wasn't possible to import from more than one stream at a time

Prevent an importer from importing the same page more than once

Allow PDFs with DecodeParms less than 4

Bug fix: Failed to read xref table: Unsupported field size

Fix for 'did not set root object'

Remove spew

Update README.md

fixed import stream identifier (#11)

* fixed import stream identifier

* Update README.md

Add acknowledgements and PDF stream example