Allow selecting decode errors bahaviour

[Serhiy]

Currently it stops convertion on any decode error:

$ html2markdown broken_text
Traceback (most recent call last):
  File "/usr/bin/html2markdown", line 9, in <module>
    load_entry_point('html2text==3.200.3', 'console_scripts', 'html2text')()
  File "/usr/lib/python3/dist-packages/html2text.py", line 781, in main
    data = data.decode(encoding)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x91 in position 4: invalid start byte

But for the files I'm working on it would be perfectly fine just to add

data = data.decode(encoding, errors='ignore')

It can be exposed as an option.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: python3-html2text 3.200.3-2
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CurrentDesktop: KDE
Date: Sat May 10 21:02:23 2014
PackageArchitecture: all
SourcePackage: python-html2text
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Stefano Rivera (stefanor)]

Forwarded to the upstream https://github.com/Alir3z4/html2text/issues/87

[Launchpad Janitor (janitor)]

This bug was fixed in the package python-html2text - 2016.1.8-1

---------------
python-html2text (2016.1.8-1) unstable; urgency=medium

  * New upstream release.
    - Long links wrapping controlled by `--no-wrap-links` (Closes: #616090)
    - Includes a --decode_errors option to customize decoding error behaviour
      (LP: #1318227)
  * Update manpage for new options.
  * Use https in the watch file.
  * Patch: python3.5 support

 -- Stefano Rivera <email address hidden> Fri, 15 Jan 2016 13:00:21 -0800