* Adds functionality to extract charset info from eml files
* Adds missed file-like object handling in detect_file_encoding
* Adds functionality to replace the MIME encodings for eml files with one of the
common encodings if a unicode error occurs
* Organize the eml example files in the example-docs/eml directory
* added function for multiple files via api
* make multiple work with files
* updated docs strings
* changelog and version
* docs and contextlib for open files
* tests for partition multiple
* add tests for error conditions
* add output example
