libopus: update 1.0.3 -> 1.1, enable tests
rtorrent: update to version 0.9.3

This version is dubbed "unstable" and apparently it lacks the man page that
used to come with earlier releases. :-(

We need the latest version, though, because of the recent update to libtorrent.
dropbear: update from 2013.60 to 2013.62
add meta.repositories.git to several packages
haskellPackages.extensibleEffects: New expression
haskellPackages.IntervalMap: New expression
haskellPackages.exPool: New expression
haskellPackages.haskelldb: New expression
Merge pull request #1347 from ocharles/extensible-effects

haskellPackages.extensibleEffects: New expression
Merge pull request #1350 from ocharles/haskelldb

haskellPackages.haskelldb: New expression
Merge pull request #1349 from ocharles/ex-pool

haskellPackages.exPool: New expression
Merge pull request #1348 from ocharles/intervalmap

haskellPackages.IntervalMap: New expression
calibre: upgrade 1.13.0 -> 1.14.0