updating bitcoin to 0.9.2.1
fixing whitespace
zotero: version bump 4.0.21.1 -> 4.0.21.2
firefox: bring back version 30.0 for zotero
Added a few VIM plugins.
rtorrent: compile with xmlrpc-c for 3rd party UIs
merge #3340: bitcoin: minor update
plowshare: version bump

From #3301.
Add taskserver package (close #3269)
merge #3462: zotero update and resurrect xulrunner
zotero: add check to detect xul version breakages
plan9port: fix eval (license typo)
nixos-container destroy: Remove gcroots
Don't silently ignore errors from the activation script
Remove unnecessary dependencies and centralize version string.
haskell-cabal-bounds: update to 0.8.1
haskell-constraints: update to 0.4
haskell-conduit-extra: update to 1.1.3.1
haskell-bytes: update to 0.14.1
haskell-json-assertions: regenerate with cabal2nix