add htop fork for darwin (close #2690)

@vcunat made it a single conditional attribute.

Conflicts (trivial):
	lib/maintainers.nix
Revert "Add vtop, update some node packages."

This reverts commit cf3a2d04751fcc875656b0af6bf2e7f728cf770d.
t1utils: new package

t1utils is a collection of simple Type 1 font manipulation programs.
lilypond: unbreak build by adding t1utils to buildInputs

lilypond needs the 't1asm' tool from t1utils to build. t1asm used to be
provided by texlive-core, but does no more  (since texlive-core-2014
update).
Merge pull request #2904 from bennofs/haskell-pipes-text

haskell-pipes-text: new expression
qt5,qtcreator: update to qt-5.2.1 and qtcreator-3.1.

Close #2643.

Testing parallel build of qt5: fine on @vcunat's 8-core (just this single task).
We'll see on Hydra.
cudatoolkit: fix multiple outputs (close #2466)
thunderbird-bin: update to version 24.6.0
nspr: update to 4.10.6

Required for Firefox 30.0.
gvfs: add more supported protocols in gnome 3.10. Closes #2880

This change has been successfully tested on gnome 3.12 (thanks
@lethalman!). Now bring it to gnome 3.10, which currently is the default
gnome3 version in NixOS.

I've build and run tested it (success: smb:// protocol now work in
Nautilus).
pass(word-store): add option to include xclip in PATH

xclip is necessary for pass(word-store) to send passwords to the
clipboard / X-selection, rather than echoing to the terminal.

The option currently defaults to false, because someone may not want the
dependency on X libraries and also pass is really quick to build (it's
just a shell script).
Removed non-free kochi-substitute and added kochi from Debian package.
Moved kochi-mincho and kochi-gothic back into one package.
Update haskell-hspec2 to version 0.3.1
Merge pull request #2911 from sol/master

Update haskell-hspec2 to version 0.3.1
pass: install bash completion script
Update haskell-hspec2 to version 0.3.3

(fixes broken Haddocks)
Merge pull request #2913 from sol/master

Update haskell-hspec2 to version 0.3.3
fix licenCe typos
Merge recent master