Haskell support

[inureyes]

• Haskell support
• For language specific course.

[adrysn]

Handling Monad is too confusing for me. I haven't figured out how to walk about among various monads yet, and this prevents me to write execution routine and intercepting std*.

Instead, I will try to write a haskell code execution script with other languages (e.g. python):

• ZMQ / std* handling is done by a python script.
• User's haskell code will be saved as a temporary file (e.g.: tmp_haskell.hs)
• The saved code will be executed by running runhaskell tmp_haskell.hs.
• The temporary file will be deleted.
• Captured execution result will be parsed and returned in a python script.