(Some smaller documentation fixes.)
Added Configuration.setSharedVariables(Map/*<String, Object>*/) for setting the shared variables from Spring IoC and other IoC solutions. The already existing Configuration.setSharedVariable(String, Object) isn't a JavaBean property so it was hard to use for that. Furthermore,  the order in which Configuration.setObjectWrapper and Configuration.setSharedVariables are called doesn't mater (unlike in the case of Configuration.setSharedVariable), which is essential in most IoC solutions.