Html-text

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Parsel dependency is removed in this release,
though parsel is still supported.

* ``parsel`` package is no longer required to install and use html-text;
* ``html_text.etree_to_text`` function allows to extract text from
lxml Elements;
* ``html_text.cleaner`` is an ``lxml.html.clean.Cleaner`` instance with
options tuned for text extraction speed and quality;
* test and documentation improvements;
* Python 3.7 support.

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Fixed a regression in 0.4.0 release: text was empty when
``html_text.extract_text`` is called with a node with text, but
without children.

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This is a backwards-incompatible release: by default html_text functions
now add newlines after elements, if appropriate, to make the extracted text
to look more like how it is rendered in a browser.

To turn it off, pass ``guess_layout=False`` option to html_text functions.

* ``guess_layout`` option to to make extracted text look more like how
it is rendered in browser.
* Add tests of layout extraction for real webpages.

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* Expose functions that operate on selectors,
use ``.//text()`` to extract text from selector.

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* Packaging fix (include CHANGES.rst)

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* Fix unwanted joins of words with inline tags: spaces are added for inline
tags too, but a heuristic is used to preserve punctuation without extra spaces.
* Accept parsed html trees.