* first pass on partition_xlsx
* add support for files
* add test for xlsx from filename
* added filetype metadata
* add xlsx to auto
* remove fake excel from unsupported
* version and changelog
* update docs
* update readme
* fix removed file reference
* fix some more tests
* pass in metadata filename
* add include_metadata flag
* function to check if pdf is extractable
* add fallback logic for unextractable pdfs
* tests for docs with copy protection
* add test for unprocessable pdf
* update docs
* changelog and version
* update logic for images; reset file before proceeding
* 3 files for api tests
* docs update