Bump version
Add interpreter session support (using interpreter threads)
Rename the directory with the Xcode project

* We don’t use that project for building, only to edit the .xib
Build docs for HSApp
Maintain state between successive operations in a session
Unknown Haskell types are marshalled as stable pointers

* Also using that in the ’HSApp’ example to make the interpreter
session persistent across callbacks.
Add :type
HSApp: Implement Load menu entry
Merge pull request #13 from mchakravarty/hsapp-sessions

HSApp: sessions