First Version of Instagram popular photo viewer app

This app is basic instagram clients. Current functionalities include:
  * Launch app with API 19
  * Have list view
  * included required libraries for AsyncHttpClient and Picaso image caching
  * Setup Instagram api client id
  * Make a request for popular photos and log the response as INFO.
Functional instagram photo viewer

  * Parse the json response from instagram
  * Create custom photo (model) adapter
  * populate picture and caption into the custom layout

Tested in emulator and easy scrolling of pictures is possible.
TODO: view holder thing to avoid doing findViewById() all the time.
adding a default image in case Picaso loading of image takes time
Modified InstagramPhoto item layout to show username and also the like count.
Basic requirements of Homework assignment complete.

 * Add readme
 * add profile picture for users
 * implemented view holder pattern for good performance.
Minor improvements in UI
Add demo gif of basic requirements
add pull to refresh support
some more defensive programming for json parsing
pull to refresh demo gif recording
minor ui tweaks
add demo walkthrough of pull to refresh and comments. The pictures are now displayed very nicely with translucent caption on the photo
Add functionality for comments

Added layout for comments
parsing is done for comments
display shows comments for two lines
Merge pull request #6 from vishalpatel/InstPopViewer

Instagram Popular photo viewer