Set book title, no more Point dummy.

Signed-off-by: ataka <masayuki.ataka@gmail.com>
Use NSString instead of char.

Warning appears when execute program:
  2013-04-05 16:21:46.236 bookshelf[13354] autorelease called without pool for object (0x9b29980) of class GSAutoreleasedMemory in thread <NSThread: 0x9afa270>

I don't understand.

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