Merge branch 'pipeline-table' into 'master'

Reduce min width of pipeline table

## What does this MR do?
Reduce min width of pipeline table

## Why was this MR needed?
The current min-width is based on the heavily populated pipelines page main table. This pipeline table doesn't have nearly as much information so can be collapsed down a lot further

![table](/uploads/895d2fb2f01383a841f973e918199f55/table.gif)   
cc @markpundsack 


See merge request !5409

app/assets/stylesheets/pages/pipelines.scss

@@ -29,9 +29,18 @@
   }
 }
 
+.pipeline-holder {
+  width: 100%;
+  overflow: auto;
+}
+
 .table.builds {
   min-width: 1200px;
 
+  &.pipeline {
+    min-width: 650px;
+  }
+
   tr {
     th {
       padding: 16px 8px;

app/views/projects/commit/_pipeline.html.haml

@@ -35,8 +35,8 @@
   .bs-callout.bs-callout-warning
     \.gitlab-ci.yml not found in this commit
 
-.table-holder
-  %table.table.builds
+.table-holder.pipeline-holder
+  %table.table.builds.pipeline
     %thead
       %tr
         %th Status