Move files from darkswarm to shared

- As this directive is now used by Darkswarm and admin, move files in shared/ folders
 - Needs some css variable in admin part : as question-mark-with-tooltip is used in admin part, it needs some css variable
 - Add own scss variables file with all needed variables for question-mark-icon. Some duplication, but now really independant and shared between both darkswarm and admin.
 - Remove strange border around the button, rendered by chrome when button is focused.

app/assets/javascripts/shared/directives/question_mark_tooltip.js.coffee

@@ -0,0 +1,18 @@
+
+OFNShared.directive "questionMarkWithTooltip", ($tooltip)->
+  # We use the $tooltip service from Angular foundation to give us boilerplate
+  # Subsequently we patch the scope, template and restrictions
+  tooltip = $tooltip 'questionMarkWithTooltip', 'questionMarkWithTooltip', 'click'
+  tooltip.scope =
+    variant: "="
+  tooltip.templateUrl = "shared/question_mark_with_tooltip_icon.html"
+  tooltip.replace = true
+  tooltip.restrict = 'E'
+  tooltip
+
+# This is automatically referenced via naming convention in $tooltip
+OFNShared.directive 'questionMarkWithTooltipPopup', ->
+  restrict: 'EA'
+  replace: true
+  templateUrl: 'shared/question_mark_with_tooltip.html'
+  scope: false