Remove unused file

h/static/scripts/annotator/plugin/fragmentselector.coffee

-# Annotator plugin for creating the Fragment Selector
-class Annotator.Plugin.FragmentSelector extends Annotator.Plugin
-
-  pluginInit: ->
-
-    # Register the creator Fragment selectors
-    @annotator.anchoring.selectorCreators.push
-      name: "FragmentSelector"
-      describe: @_getFragmentSelector
-
-  # Create a FragmentSelector around a range
-  _getFragmentSelector: (annotation, target) =>
-    fragment = (new URL(@annotator.getRawHref())).hash
-
-    [
-      type: "FragmentSelector"
-      value: fragment
-    ]