fix(dialog): autoclose fixed and close animation shrinks to originati…

…ng element poisition.

capture originating element and position, If targetEvent element is hidden when dialog closes, shrink to the element's original position.
add tests to verify that the correct CSS transforms are set when expanding and shrinking.
code refactor to fix listeners
fix clickOutsideToClose escape keyup listeners to auto-close.

Closes #3555. Fixes #3541. Fixes #2479.

src/components/dialog/demoBasicUsage/script.js

@@ -10,6 +10,7 @@ angular.module('dialogDemo1', ['ngMaterial'])
  $mdDialog.show(
  $mdDialog.alert()
  .parent(angular.element(document.body))
+ .clickOutsideToClose(true)
  .title('This is an alert title')
  .content('You can specify some description text in here.')
  .ariaLabel('Alert Dialog Demo')
@@ -21,13 +22,13 @@ angular.module('dialogDemo1', ['ngMaterial'])
  $scope.showConfirm = function(ev) {
  // Appending dialog to document.body to cover sidenav in docs app
  var confirm = $mdDialog.confirm()
- .parent(angular.element(document.body))
- .title('Would you like to delete your debt?')
- .content('All of the banks have agreed to forgive you your debts.')
- .ariaLabel('Lucky day')
- .ok('Please do it!')
- .cancel('Sounds like a scam')
- .targetEvent(ev);
+  .parent(angular.element(document.body))
+  .title('Would you like to delete your debt?')
+  .content('All of the banks have agreed to forgive you your debts.')
+  .ariaLabel('Lucky day')
+  .ok('Please do it!')
+  .cancel('Sounds like a scam')
+  .targetEvent(ev);
 
  $mdDialog.show(confirm).then(function() {
  $scope.alert = 'You decided to get rid of your debt.';