Fix for issue #61

Improve LinePlusBarChart documentation
Merge pull request #62 from oz123/develop

Fix for issue #61
Add @oz123 to contributors
bit of code refactoring
Merge branch 'develop' of github.com:areski/python-nvd3 into develop
Fix for issue #61

Improve LinePlusBarChart documentation
Add @oz123 to contributors
Add chart extras to template and add documentation
Add missing requirements

 * So that make build target works

 setuptools is redundant in requirements

 * If you distribute a file with setuptools (pip, virtualenv and so)
   It's OK to assume setuptools is pre-existing
Merge pull request #64 from oz123/develop

Add extra parameters to graphs and missing requirements
Allow easier customizing of the y-axis formats

This is especially useful if you have a line
and bar chart with two data series with extreme differences.
Such as:

    data_y1 = [10, 13, 14, 20]
    data_y2 = [0.0003, 0.0032, 0.0057, 0.0081]

In the above case one may one would like to format the first
y axis with:

        cart.y1Axis
                    .tickFormat(d3.format(',f'));

and the second y axis with:

        chart.y2Axis
                    .tickFormat(function(d) {
                     return d3.format(',0.4f')(d) });

This is now possible with passing a keyword ```yaxis2_format```
when creating a new ```linePlusBarChart`:

    chart = linePlusBarChart(name="linePlusBarChart",
                             width=500, height=400, x_axis_format=None,
                             yaxis2_format="function(d) { return d3.format(',0.4f')(d) }")
Merge pull request #65 from oz123/develop

Allow easier customizing of the y-axis formats
Update README to show the correct build
Merge pull request #66 from oz123/develop

Update README to show the correct build
Prepare the base for including js graphs

 * This huge commit addes the _page.html template
   with inclusion of the d3 and nvd3 static files
 * Remove some more references to pngs
 * Remove the pngs themselves from the tree
 * Remove all references to hard coded images
 * Add js css and page template
Replace automodule instructions with autoclass

All the classes are available from nvd3 directly,
so it make sense to treat them as classes rather then module.
That said, the modules containing the classes, are pointed from
the module index!
Replace hard coded js with cloudflare
Improve README.rst

Usage and teaser  before boring technical details
all classes now include live js code
Small improvements of the documentation