update build settings
change define on logger
open default calculator

crashes on close
update xcode project to recommended settings
fix deprecated method createDirectoryAtPath:attributes:
fix deprecated method runModalForTypes:
fix deprecated method -filenames
fix deprecated method filename
deprecate readFromObject:error: and saveObjectAs:error:

deprecate readFromObject:error: in favor of readFromObjectURL:error:
deprecate saveObjectAs:error: in favor of saveObjectAsURL:error:
add readme
add license
Merge develop branch from mtrovilho