Remove some gitignored files.
Ensure KakuroCellView doesn't return nil from toString

When an answer cell has no answer, return the string @"0"
instead of nil or an empty string.
Ensure KakuroEditor directories use camelcase

Ensure that all the subdirectories within the
KakuroEditor project correctly use camelcase.
Make KakuroEditor export puzzles as json

Instead of simply using a comma separated list,
make Kakuro Editor export puzzles as json.
Create simple model for KakuroCore

Create model classes for KakuroCore. KakuroCore
is a project that will eventually grow into
a static library that will provide classes to
store, solve, and generate Kakuro puzzles.
Make KakuroCore a dependency of KakuroEditor

Add KakuroCore as a sub-project of the KakuroEditor
project, and add its target as a dependency.