Handle Content-Disposition: inline and attachment without filename
* Add new email test example and test with Content-Disposition: inline.
* Move attachment_info above for loop so it is always defined
* Check if item is inline as well as attachment as these both lack an = character to split on
* Create filename if filename is not specified and write file.
* Update list_attachments with new filename
Fix attachments with = in filename
* Limit split to first match of = to prevent creating a list of more than two parts
* Add example email with attachment name and test for issue
* 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
