PDF report engine reworked :

- better styles inheritance
- rough implementation of a pie-chart
- removed proprietary fonts
- moved FPDF engine into webget directory
- FPDF scripts as plugins
- customizable fonts directory in order to have the possibility to use
  proprietary fonts in your own projects
- other small bug fixes

Others modifications :

- renamed "demo-projet" to "reference"
- added some examples
Merge branch 'master' of https://github.com/kaleidoscopeit/gframework