Merge branch 'master' of github.com:plotfx/plotfx

## Getting Started

[![A simple line chart](./examples/linecharts/lines_with_points.svg)](./examples/linecharts/lines_with_points.plot)

[![A simple line chart](./examples/linecharts/lines_with_points.svg)](./examples/linecharts/lines_with_points)

The simple line chart from above was generated with PlotFX using the following

command line:

    $ plotfx --in example_chart.plot --out example_chart.svg

    $ plotfx --in example_chart.ptx --out example_chart.svg

Here is the input file from which the above plot was generated (`example_chart.plot`):

Here is the input file from which the above plot was generated (`example_chart.ptx`):

    width: 1200px;

    height: 480px;