Big day today

Firstly I made the Pet model a Singleton, which means that only one
instance of Pet can be used throughout the entire app. This way there
can't be multiple pets in different activities. everything is
synchronized.

Secondly, the pet image is now saved and loaded to and from the SD card.
This prevents pet accessories from being lost.

Customization is working, still needs improvement though! Accessories
will be able to be placed more accurately once we have pictures with
good dimensions.
Everything is done in AccessorizeActivity, didn't use controllers or
custom views.

Best part is, all this is expandable and more accessories, animals. and
colors can easily be added. Need more awesome animal pics, Christy!
Merge branch 'master' of https://github.com/zellarsm/PhonePet