Email_Invoice_Handler

Using IMAP to receive emails, pdfplummer to check the invoices in the attachment, SMTP to send them to my accountant.

Using a lot of code from @Paramiao, https://github.com/paramiao/pyMail. This pyMail.py is sufficient for basic email scripting.

I added support for Chinese and updated old APIs.

main.py does:

1. Goes over INBOX
2. Collect the invoice(fapiao) using a temperary directory
3. Archive emails with legit invoice (If target folder name accurate in credentials.conf)
4. Plots a summary

**Note:

It is important to rename credential-sample.conf to credential.conf.

Don't use quotes in .conf.