Scaffold projects

Basic CRUD operations for Project model.
Project CRUD

Simple create, read, update, delete operations for project model.
Autoincrementing project number (scoped by account)

To make it easier to refer to projects offline we are adding an
autoincrementing project number. To keep things simple we are
autoincrementing from #1.
Added project.amount as money

Created Money object for project.amount. Money is saved as an integer as
cents. Reading the amount converts back to BigDecimal. Set limit of 1
trillion dollars as min/max so we won't accidentally go out-of-range.
Added project.num index

Project.max(:num) is called regularly. This index is a minor tweak to
improve performance.
Flatten iOS 7 style icon and use only 152x152

It's useless to create all these different icons. The phones are
powerful enough to handle the same 152x152 icon. Loy Moser flattened the
icon to better match iOS 7's new style.