Add balajisivaraman to maintainers
Add Meslo LG & Meslo LG DZ fonts.

Clean up description as per Nix standards.
Add libcec 2.1.4
Add libcec support to xbmc
Remove http_proxy/ftp_proxy overrides used in setup hooks.

Partially reverts eaa4db148dc402f7a124bc9c17583067710a7814. Used
together with nix-shell it results into unresolvable domains. For
example: `nix-shell -p libxml2` spawns a shell with non-working DNS.

chroot should remove such unpurities.
cantata: update to 1.5.0
A language security tool called Hammer is added
mediatomb: fix build by fetching a slightly newer git revision which has patches for new versions of dependencies, add more dependencies, clean up.
Allow to configure freetds for unixODBC support
kickstart travis after upstream patch landed
derp'ed the sha256 for hammer after patch landed
added git revision to nix hammer pkg to prevent nix build breaks on hammer update
format changes + meta data changes to hammer package
changed version = e7aa734
Merge pull request #4714 from sjmackenzie/new-pkg-hammer

A language security tool called Hammer is added
libassuan: 2.1.1 -> 2.1.2
pinentry: 0.8.3 -> 0.8.4
yubico-piv-tool: Add derivation
libksba: 1.2.0 -> 1.3.1
libusb: 1.0.18 -> 1.0.19