Haskell snap

[aforemny]

Add haskell-snap package with dependencies.

As it turned out haskell-snap and dependencies are already in master and I just didn't noticed that. But I cannot build haskell-snap-ghc7.4.1 from master. This is fixed in my haskell-snap branch by adding some older packages as dependencies. Testing done: haskell-snap-ghc7.4.1 built locally.

[peti]

Please don't mix default.nix and version-number.nix files in the same directory. If a package is provided in more than one version, then all related files should use the version-number-style file name. Similarly, the attribute names in haskell-packages.nix should be consistent, i.e. there should be one package_x_y_z attribute per version, and one package = self.package_x_y_z attribute that redirects to the latest (or most stable) version that other packages should refer to by default.

[peti]

Also, I don't understand why this pull request contains a patch that removes autoconf 2.67? That seems unrelated?

[aforemny]

@peti Yes, the first three commits are unrelated to this pull request. I accidentally created a new branch from my XBMC branch instead of master. The last commit removes those unrelated commits, however. Sorry for the noise in the commit log.

[peti]

@aforemny, are you planning to address the points I've mentioned?

[aforemny]

@peti, you suggested a different naming convention for both files and attributes. See commit 8ea5b1a. Further, you asked about the commit history. I commented on this in the pull request. What else is to be done? I am sorry if the commit
8ea5b1a is not properly included. I am not that familiar with Git. Also, I can clean up the commit history if necessary.

[peti]

Sorry, I didn't see your last commit. I assumed Github would notify me when the pull request changes, but apparently it didn't. Anyway, your changes are now merged to master. Thank you!