Merge pull request #3 from gguuss/master

Minor updates in comments for api/friends servlet.  Changes to comments only.
Added signin callback to invite interactive post.
Merge pull request #6 from silvolu/invite-signin-callback

Fix for #5.
Removing @deprecated annotations to resolve Issue 4
Merge pull request #7 from joannasmith/master

Addressing Issue 4
Added JSON annotations to Message.
Merge pull request #8 from leedenison/master

Add JSON annotations to Message.java
Fixed filtering photos by theme.
Fixed voteCta URL
Commented out appackagename in signin button
Cleaned up the code style.
Image upload URls are returned in JSON {"url": "https://someuploadurl"} and failed moment writing is ignored.
Return error when moment fails to write
Updated comments.
Merge pull request #12 from leedenison/master

Update comments to match documentation.
UploadUrl is moved to a new public model class so that it can be reused.
Add UploadUrl file.
Log severe error for failed moment write, return success to client for photo upload.
Merge pull request #11 from cartland/master

Image upload URLs returned in JSON and ignore failed moments
Fixing line wrapping