Made initial uiimageview class and categories
Initial Setup
Merge branch 'demo' into develop
resolved conflict
minor changes
added methods to category
directory path for DiskCache changed
resolved conflict and merged
Made minor chnages in ImageLoader
Merge remote-tracking branch 'origin/dataSource' into memoryCache
added noperation class for image downloading
added NSString + MD5 category
impementation of imageLoader
conflict resolved
NSoperationQueue added in ImageLoader