New sample page for Bookmarks (v2beta2)

[jwasilgeo]

Create a new sample page for bookmarks

This should ideally include:

• test page
• functional tests
• example page in the gh-pages site
• deal with info in comment below

Originates from #194.

[jwasilgeo]

Functional tests have been written, but sometimes the webscene slides demo just doesn't load (both as a test page or within the gh-pages site). Not sure if maybe setting the self.map property is within the angular digest cycle, which the <esri-scene-view> depends on to happen.

• More investigation is needed before finishing this issue.

[jwasilgeo]

See 12cb742

[jwasilgeo]

@tomwayson in continuing to use $scope.$appy(), I encountered a few times when scope was attempting to be applied when the digest cycle was already running, erroring the app or a sample page out. Digging around some more online actually has led me to start trying to use $scope.$evalAsync.

Some more here:
angular/angular.js#2023, which led me to
https://groups.google.com/d/msg/angular/iXnA80JOZUg/PYD6KWjNbwkJ

See 6ff1fd4

[tomwayson]

I've been thinking the $scope.$apply() issues we've been having are symptoms of larger problems, so I'm not real keen on $scope.$evalAsync as the solution. I've started on trying to diagnose the root causes and propose some fixes.

First, I noticed #219. Until we figure out what to do about that, it's probably safest to use the promise form of esriLoader.require() when experiencing async/digest weirdness.

Next, the call to $sccope.$apply() w/in the view.then() here makes sense, but it's inconsistent w/ the way the v1 map directive's load event worked. So I'm proposing the changes in #220.

@jwasil, please review #219 and #220 and let's have a pow-wow.