FacebookAccount.uploadImage(): Add javadoc for parameter context
FacebookAccount: Use notification IDs from class NotificationUtils
If image files to be uploaded are missing, display notification with details
MediaShareActivity.uploadMedia(): Rename parameter and declare it as final
MediaShareActivity: Declare a few method parameters as final
FacebookAccount: Add new method uploadImageCollection, that can upload multiple images at a time
MediaShareActivity.uploadMedia(): Use new method FacebookAccount.uploadImageCollection() for uploading multiple images
FacebookAccount.uploadImageCollection(): Declare local variable as final