NSMutableArray bookshelf is prepared for containing books.

Signed-off-by: ataka <masayuki.ataka@gmail.com>
New book 'Foundation and Empire' is added to bookshelf.

Signed-off-by: ataka <masayuki.ataka@gmail.com>
Change id to Book*.

Signed-off-by: ataka <masayuki.ataka@gmail.com>
Add third book 'Second Foundation'.

Signed-off-by: ataka <masayuki.ataka@gmail.com>
Book class has new variable 'author'.

Signed-off-by: ataka <masayuki.ataka@gmail.com>
Add 4th book, "Ender's Game".

Signed-off-by: ataka <masayuki.ataka@gmail.com>
Split book class to book.[mh].

Signed-off-by: ataka <masayuki.ataka@gmail.com>
'make clean' remove *.d file, which is automatically generated when compile.

Signed-off-by: ataka <masayuki.ataka@gmail.com>
Use @property for Book.title.

Use @dynamic to use old setter and getter.
Rename getter of Book title from getTitle to title.

Signed-off-by: ataka <masayuki.ataka@gmail.com>
Use @synthesize for book.title.

Use @property(copy) instead of @property(retain).
I don't use ARC.  Can I use @synthesize without ARC?

Signed-off-by: ataka <masayuki.ataka@gmail.com>
Use @parameter and @synthesize for book.author.

I got warning:
  book.m: In function '-[Book setAuthor:]':
  book.m:7:1: warning: unused parameter '_value' [-Wunused-parameter]
  book.m: In function '-[Book setTitle:]':
  book.m:7:1: warning: unused parameter '_value' [-Wunused-parameter]

Is this bug of GNU GCC Compiler?

Signed-off-by: ataka <masayuki.ataka@gmail.com>
New class 'Bookshelf'.

Signed-off-by: ataka <masayuki.ataka@gmail.com>
Access property with dot style instead of message style.

Signed-off-by: ataka <masayuki.ataka@gmail.com>