Merge pull request #6 from AndreasVoellmy/master

Edits to "Network Programming in Haskell" section.
adding reviewer's comment.
modifying the draft according to reviewers' comments.
modifying.
modifying.
fixing issue number.
Removing unnecesary words.
modifying.
adding an issue.
modifying.
modifying.
modifying.
adding issues.
A few updates
removing some FIXME.
updating benchmark results.
fixing explanation of benchmark.
updating benchmark.
brushing up explanation about parallel IO manager.
brushing up.