Implemented action sheet on |Add new book|

Implemented action sheet.
TODO: add new book view.
Cleaned up the code to fit 80 characters.
Implemented UIImagePickerController

When the user tapping "add Image" button in DetailView, he will
be presented with UIImagePickerController either to shoot the book,
or to choose the photo from library.
Cleaned up the code
Added popup controller to DetailView
Fixed memory leak in BookStorage
Merge commit '37b9a12c27773fcbd72e17f484060b64501d9d19' into feature/bookImage
Added option to ignore xccheckout file, newly added in Xcode 5
Moved detailView to UITableView
Started GoogleBooks integration