Previously this check was only emitted on Python 3. Now it is
also emitted on Python 2.

Handle the disallow-trailing-tuple chck more sanely by verifying non-terminating newlines. Close #1424

We were using editdistance, which is super fast, but the downside is that
it might require a compiler on some envs in order to be installed. As such,
it is also a hindrance not just for these kind of envs, but for PyPy as well,
since it is written in C. Let's use a handcraft implementation
for now.
Close #1423

Exceptions have a different type since astroid 1.5.0, use a visit_exceptioninstance method for them. Close #1419

This is controlled through the new flag ``--ignore-on-opaque-inference``, which is by
default True. The inference can return  multiple potential results while
evaluating a Python object, but some branches might not be evaluated, which
results in partial inference. In that case, it might be useful to still emit
no-member and other checks for the rest of the inferred objects.

Don't emit missing-final-newline or trailing-whitespace for formfeeds.

Keep the builtin str.splitlines but check for the superset characters and recombine them later.
Close #1218.
Close #1219

Add a new warning, assign-to-new-keyword.

This warning is emitted whenever we detect an assignment to a
variable name that will become a keyword in the future.

https://docs.python.org/3/whatsnew/3.6.html#deprecated-python-behavior

Closes #1389

Closes #1399

- Use correct capitalisation of PyCQA organisation in Github links
- Use current version number (1.7) in ChangeLog file
- Use readhedocs URL instead of outdated docs.pylint.org
- Avoid here in links in favor of actual info on link we're pointing to

Fixes #1383