JpGraph from http://jpgraph.net/

This is a port for Symfony2 to put JpGraph as a Vendor library, by https://github.com/ztec/JpGraph and forked here by https://github.com/fabic for pulling in forks and eventual fixes.

Use JpGraph\JpGraph::load(); and JpGraph\JpGraph::module('moduleName'); to load required modules.

• See fork notes at README-fabic.md
• Did submit this to packagist.org as fabic/jpgraph (even though this is yet another fork, for I may maintain this for about one year) : https://packagist.org/packages/fabic/jpgraph
• The original Ztec's package is jpgraph/jpgraph at https://packagist.org/packages/jpgraph/jpgraph
• refs/tags/v3.5.0b1 references a tree that shall be the exact version of source from the official tarball (hence before everyone played with it).