Extract and split GFM auto-completion setup JS

* static initialization and setup moved to assets
* per request initialization moved to layout partial

app/views/notes/_common_form.html.haml

@@ -36,49 +36,3 @@
           %a.file_upload.btn.small Upload File
           = f.file_field :attachment, class: "input-file"
         %span.hint Any file less than 10 MB
-
-:javascript
-  $(function(){
-    // init auto-completion of team members
-    var membersUrl = "#{root_url}/api/v2/projects/#{@project.code}/members";
-    var membersParams = {
-      private_token: "#{current_user.authentication_token}",
-      page: 1,
-    };
-    var membersData = [];
-    $('.gfm-input').atWho('@', function(query, callback) {
-      (function getMoreMembers() {
-        $.getJSON(membersUrl, membersParams).
-          success(function(members) {
-            // pick the data we need
-            var newMembersData = $.map(members, function(member) { return member.name });
-
-            // add the new page of data to the rest
-            $.merge(membersData, newMembersData);
-
-            // show the pop-up with a copy of the current data
-            callback(membersData.slice(0));
-
-            // are we past the last page?
-            if (newMembersData.length == 0) {
-              // set static data and stop callbacks
-              $('.gfm-input').atWho('@', { data: membersData, callback: null });
-            } else {
-              // get next page
-              getMoreMembers();
-            }
-          });
-        // next request will get the next page
-        membersParams.page += 1;
-      })();
-    });
-
-    // init auto-completion of emoji
-    var emoji = #{emoji_for_completion};
-    // convert the list so that the items have the right format for completion
-    emoji = $.map(emoji, function(value) {return { key: value+':', name: value }});
-    $('.gfm-input').atWho(':', {
-      data: emoji,
-      tpl: "<li data-value='${key}'>${name} #{escape_javascript image_tag('emoji/${name}.png', :size => '20x20')}</li>"
-    });
-  });