initial core model and viewmodel
bring in touch-specific libraries
convert app delegate to use mvvmcross
add initial create item view
remove unused screens
add title to create item button
upgrade cirrious libraries to current
call into viewmodel on button click
add fields for name and description
appglu crud call to create item
use product table instead of item
disable submit when info is not complete
Merge branch 'create-item-screen'