Changed file name, added contextual inference example
Added HebbianLinks, changed query
Added an example for PLN inference with ContextLinks
Put all inputs in ListLink
Changed HebbianLink to AssociativeLink, removed stv

It is still unsure, though, if AssociativeLink is the best option, as it doesn't seem to be documented
Added partial explanation for nested links
Merge pull request #776 from sebastianruder/rwr

Changed file name, added contextual inference example