Get image thumbnails for various categories. Handle orientation and
Network changes.

Now there is a placeholder image before the actual image is fetched
and a error image incase the internet gets cut off between operation.
I have conducted a break test, it still has a lot of ways of crashing
The extra footer bug still exists. Also Lubes link has to be updated
server side. The Construnction Equipment category alone somehow
just started causing a internal error in picasso. This developed
recently. Orientation change and network changes have been handled.
tried to implement a spinner when the list loaded, found out that
project.properties file still was using target as 19, changed it to 21.

Signed-off-by: Aditya Prasad <adityaprasadiskool@gmail.com>