angular directives module with navTabs directive

Add a directives module. For now it has one directive, 'navTabs',
which automatically focuses the first input element when switching
tabs.

h/js/src/directives.coffee

+navTabsDirective = (deform) ->
+  link: (scope, iElement, iAttrs, controller) ->
+    iElement.find('a')
+
+    # Focus the first form element when showing a tab pane
+      .on 'shown', (e) ->
+        target = $(e.target).data('target')
+        deform.focusFirstInput(target)
+
+    # Always show the first pane to start
+    .first().tab('show')
+  restrict: 'C'
+navTabsDirective.$inject = ['deform']
+
+angular.module('h.directives', ['deform'])
+  .directive('navTabs', navTabsDirective)