- Add an AngularPollChannel class for easier handling of HTTP polling.

- Convert the build view page over to use the new class
- Add code so that if the builds logs returned by the API start in the set we already have, we only add the new ones

static/partials/repo-build.html

@@ -94,7 +94,7 @@
             </div>
           </div>
           <div style="margin-top: 10px">
-            <span class="quay-spinner" ng-show="polling"></span>
+            <span class="quay-spinner" ng-show="pollChannel.working"></span>
             <button class="btn" ng-show="(build.phase == 'error' || build.phase == 'complete') && build.resource_key"
                     ng-class="build.phase == 'error' ? 'btn-success' : 'btn-default'"
                     ng-click="askRestartBuild(build)">