added hasBestandsverlaufOpen

added some comments
added hasBestandsverlaufOpen

added some comments
totally re-engineered

renamed Bestandsverlauf to Chronology, new subclasses, class logic,
overview etc.
classes headlines
some typos
some typos
minor changes in overview
minor: headlines of individuals
simplified domain of hasBegin
minor: some changes
new properties caption temporalextend itemized

stronger logic in chronology
added example.md
addes makespec as submodule
with examples and axioms
minor: examples link
untracked changes.md
untrack makespec
updated ecpo.md
deleted comment properties and added examples for usage of dublin core
added mardown to gh-pages