-Reformatted spacing on all files

-Created new AsyncTask DownloadFeedTask to handle downloading the flickr feed in the background, now the jsonString that is parsed comes directly from the server instead of a hard-coded constant string
-Removed unnecessary Constants and moved the LogLevel constant to within the Log class for better encapsulation
-Refactored out a FlickrFeedPagerActivity.initializeViewPager() method for better readability and also to enable the DownloadFeedTask to have a method to call when it has completed.