Group similar builds

We group builds by removing from the builds name two numbers which are delimted by whitespace or colon:

• name 0 1 => name
• name 0:1 => name
• name 0/1 => name
• name 0:1 ruby => name ruby
• name 0/1 ruby => name ruby
• 0 1 name ruby => name ruby
• 0:1 name ruby => name ruby
• 0/1 name ruby => name ruby

Screenshot (currently it shows a number of grouped builds):

Screenshot with design update:

app/assets/stylesheets/pages/pipelines.scss

@@ -318,9 +318,17 @@
 
     .build-content {
       width: 130px;
-      white-space: nowrap;
-      overflow: hidden;
-      text-overflow: ellipsis;
+
+      .ci-status-text {
+        width: 110px;
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+        vertical-align: middle;
+        display: inline-block;
+        position: relative;
+        top: -1px;
+      }
 
       a {
         color: $layout-link-gray;
@@ -331,13 +339,74 @@
             text-decoration: underline;
           }
         }
+      }
+
+      .dropdown-menu-toggle {
+        border: none;
+        width: auto;
+        padding: 0;
+        color: $layout-link-gray;
+
+        .ci-status-text {
+          width: 80px;
+        }
+      }
+
+      .grouped-pipeline-dropdown {
+        padding: 8px 0;
+        width: 200px;
+        left: auto;
+        right: -214px;
+        top: -9px;
+
+        a:hover {
+          .ci-status-text {
+            text-decoration: none;
+          }
+        }
+
+        .ci-status-text {
+          width: 145px;
+        }
+
+        .arrow {
+          &:before,
+          &:after {
+            content: '';
+            display: inline-block;
+            position: absolute;
+            width: 0;
+            height: 0;
+            border-color: transparent;
+            border-style: solid;
+            top: 18px;
+          }
+
+          &:before {
+            left: -5px;
+            margin-top: -6px;
+            border-width: 7px 5px 7px 0;
+            border-right-color: $border-color;
+          }
 
+          &:after {
+            left: -4px;
+            margin-top: -9px;
+            border-width: 10px 7px 10px 0;
+            border-right-color: $white-light;
+          }
+        }
+      }
+
+      .badge {
+        background-color: $gray-dark;
+        color: $layout-link-gray;
+        font-weight: normal;
       }
     }
 
     svg {
-      position: relative;
-      top: 2px;
+      vertical-align: middle;
       margin-right: 5px;
     }
 
@@ -442,7 +511,7 @@
       width: 21px;
       height: 25px;
       position: absolute;
-      top: -28.5px;
+      top: -29px;
       border-top: 2px solid $border-color;
     }