Updated README.md: syntax, formatting
Configure_ipython_beautifulsoup, unicode, p, print()

* Added configure_ipython_beautifulsoup (#2)
* Unicode-safed and optimized render methods (to avoid str copies)
* from __future__ import print_function (Python3 compatibility)
* Updated p() with conditional use of requests.get
Added README.rst and setup.py:long_description

* For pypi
* Github also supports README.rst (could remove README.md)
Added TestIPythonBeautifulSoup(unittest.TestCase): unicode
Added assertTrue(isinstance(output, unicode)) to tests
[mod] autopep8
[mod] extract tests in a test.py
[mod] modify travis.yml to match new tests
[mod] yaml conventions
[mod] blank lines for lisibility
[mod] don't put an hr if we don't display the html
[fix] css files can also be found in <link> tags
[mod] remove useless assignation
[mod] let's try, I think that github find README.rst, let's avoid duplication
[enh] add contributors
[doc] explain how to use configure_ipython_beautifulsoup
[doc] update teaser.png to match reality
[doc] same for 1.png