bindings: bindings depend on lively.lang.Closure
cmdline search: fix file search in presence of symlinks pointing to nonexisting files
search: improved updating, don't search for old terms
dirviewer: deleteSelectedFileInteractively, createDirInteractively
ObjectEditor: select new method on creation
layouting: saner dropping behavior in presence of placeholders and layouting
morphic anim: fix double invocation
paths: fix path shape bounds when not yet rendered
morph previews: fix extent of preview
sliders: preperation for double-slider (time slider)
l2l / login: small cleanup
Update .travis.yml

Adding slack integration
Travis: Activated debug flag
Travis: Temporary disabling advanced IndexedDB tests (currently failing for Travis)