Finsihed implementing chart gemerator script for impstats.

CSV Data generated by statslog-splitter is needed.
To run the chart script, the following packages need to be installed:
	- python pip
	- python cairosvg
With pip install these packages:
	- pip install CairoSVG tinycss cssselect pygal
Finished statslog graph and splitter script.

Also added needed javascript files, so they can be included into the svg files.
This removes dependencies on external sources.

The statslog-splitter can now automatically generated SVG or PNG charts together
with an index.html in the output directory. This helps taking a quick view on all
generated stats data.