bump version to 5.1.0
removed recursiveness from story datatype
no need to fix skiplists, not used anymore
remove skip label altogether
remove some more dead code
rename NodeOps.apply to NodeOps.prop
remove RelationshipOps
replace Traversal with NodeOps
fix applyNarration
fix parc
remove old Traversal
full optimizations on js
improve layerAbove
fix strategies
fix infinite recursion
simplify update dates calculation
rewrote how strategies work … not sure if this is better
screw the strategy nonesense
improve runner
fix index page crashing on invalid bookmarks