removed contexts are initialized during another phase, remove the
obsolete logging
a typo fixed
various tweaks, mostly typos + minor clean-up
tweaks to stop tracking removed contexts in the saturation state. was
used only for taxonomy cleaning so better maintain this in the taxonomy
state
some simplification and reorganization for incremental stages
Merge branch 'master' into feature/stages

Conflicts:
	elk-reasoner/src/main/java/org/semanticweb/elk/reasoner/stages/IncrementalClassTaxonomyComputationStage.java