WB 2.08.x

! /framework/initialize +
! /framework/WbAutoloader abbreviation list moved to initialize; added method getAbbreviations()

! update revision properties for all files
- include/Sensio/Twig remove Version 1.13.2

! WbAutoloader added possibility to load classes with additional file prefix 'class.'

1. solved installation issues
   ! upgrade-script sanitize pages_directory before creating access files

fixed Errorhandling for old class.database

some modifications concerning the new autoloader
Twig Template engine v.1.7.0
some droplets actualisized
unfinished changes in installer