Html-text

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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.

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* Travis-CI and codecov.io integrations added