feat(matrix ui): show row count

Author: bethesque

lib/pact_broker/ui/views/matrix/show.haml

@@ -72,7 +72,8 @@
       %input{type: 'submit'}
 
 
-
+  %p{style: 'text-align:right'}
+    = "#{lines.size} lines"
   %table.table.table-bordered.table-striped{id: 'matrix'}
     %thead
       %th.consumer