Add advanced documentation examples

[martey]

There are a number of advanced features of the Graph API which it would helpful to have examples of in the documentation. These include:

• adding tags to an uploaded photo
• updating an existing photo
• pagination (see document how to use pagination #85)
• searching public posts
• realtime API updates

[ar-anvd]

@martey

How about targeting and feed_targeting when posting? This type of things are not clear how to use in docs about put_object, btw

https://stackoverflow.com/questions/44856841/create-wall-post-and-include-privacy-settings-based-on-localization