Import fails on Python3.5

[gnunicorn]

It appears something is seriously broken when trying to install lassie with Python 3.5. Install goes fine but when importing I get here:

Python 3.5.0 (default, Sep 23 2015, 04:41:38)
[GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.72)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import lassie
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/ben/dev/beavy/venv/src/lassie/lassie/__init__.py", line 19, in <module>
    from .api import fetch
  File "/Users/ben/dev/beavy/venv/src/lassie/lassie/api.py", line 11, in <module>
    from .core import Lassie
  File "/Users/ben/dev/beavy/venv/src/lassie/lassie/core.py", line 13, in <module>
    from bs4 import BeautifulSoup
  File "/Users/ben/dev/beavy/venv/lib/python3.5/site-packages/bs4/__init__.py", line 30, in <module>
    from .builder import builder_registry, ParserRejectedMarkup
  File "/Users/ben/dev/beavy/venv/lib/python3.5/site-packages/bs4/builder/__init__.py", line 308, in <module>
    from . import _htmlparser
  File "/Users/ben/dev/beavy/venv/lib/python3.5/site-packages/bs4/builder/_htmlparser.py", line 7, in <module>
    from html.parser import (
ImportError: cannot import name 'HTMLParseError'

[gnunicorn]

It appears this also caused by a broken dependency. With the latest version of Beautiful soup (4.4.1), the import works fine. Guess someone forgot to update dependencies here...

[michaelhelmick]

Yeah, I'm not a Python 3.x user full-time yet, and Travis doesn't test against 3.5.

We'll want to do two things:

• Add Python 3.5 to the python test matrix
• Update BeautifulSoup4 requirement to 4.4.1

[michaelhelmick]

I tested updating the dependency and confirm it works.

[gnunicorn]

Doing a PR for both of this now.

[gnunicorn]

PR pending.

[michaelhelmick]

@ligthyear 0.6.2 is officially released. Thanks!