ENH: Added more options for formats.style.bar

You can now have the bar be centered on zero or midpoint value (in addition to the already existing way of having the min value at the left side of the cell) Fixed line too long `git diff upstream/master | flake8 --diff now passes` Change the tests to match new float formats. Added documentation on the new df.style.bar options for align and Colors in the documentation. Fix versionadded ENH: Added more options for formats.style.bar You can now have the bar be centered on zero or midpoint value (in addition to the already existing way of having the min value at the left side of the cell) Fixed line too long `git diff upstream/master | flake8 --diff now passes` Change the tests to match new float formats. Added documentation on the new df.style.bar options for align and Colors in the documentation. Fix versionadded Check for bad align value and raise. Wrote test for it too Added a simple example before the parametric one Added a whatsnew note Replaced 'self.assertEqual(left, rigth)' by 'assert left == right' like @TomAugspurger asked rebased

Author: jmarrec