Half implemented XMLParser. Added data package with classes for product,
image and collection.
XMLParser tested. It works.
Changes of view classes to use data from list of collections.
Implemented Parcelable for Products and ImageWithProducts. Added default
image. Added global data for MozartApplication.
Implemented serialization. Main activity collections buttons. Edited
catalog (2 collections). Edited parser (for better description view).
Edited size of description frame.