feat(core): add scrollable view properties to connected pos strategy (#2259)

* feat(scroll): provide directive and service to listen to scrolling

* review response

* fix lint

* move scroll to overlay

* feat(scroll): hide tooltip when clipped by scrollable container

* use overlay for clipping instead of trigger

* add tooltip test

* add test for scroll dispatcher

* add comment about the ScrollableViewProperties

* revert tooltip demo

* add extra lines to tooltip demo files

* add connected position strategy tests

* make lint happy

* add scroll demo to tooltip

* make FF and IE happy in tests

* change test back to Chrome

* remove fdescribe

* resolve comments

* remove usage of scrollables until throttling is set up

* remove sha

* remove combineLatest

* remove unused OnInit import

Author: andrewseguin

src/demo-app/tooltip/tooltip-demo.html

@@ -3,12 +3,12 @@ <h1>Tooltip Demo</h1>
 
   <p class="centered">
     <button #tooltip="mdTooltip"
-        md-raised-button
-        color="primary"
-        [mdTooltip]="message"
-        [mdTooltipPosition]="position"
-        [mdTooltipShowDelay]="showDelay"
-        [mdTooltipHideDelay]="hideDelay">
+            md-raised-button
+            color="primary"
+            [mdTooltip]="message"
+            [mdTooltipPosition]="position"
+            [mdTooltipShowDelay]="showDelay"
+            [mdTooltipHideDelay]="hideDelay">
       Mouse over to see the tooltip
     </button>
   </p>

src/demo-app/tooltip/tooltip-demo.ts

@@ -12,5 +12,5 @@ export class TooltipDemo {
   position: TooltipPosition = 'below';
   message: string = 'Here is the tooltip';
   showDelay = 0;
-  hideDelay = 0;
+  hideDelay = 1000;
 }