Bug#718225: live-build should authenticate files it downloads

[jnqnfe <jnqnfe@gmail.com>]

Additional patch attached (based on 5.x work). It promotes the gpgv
dependency to recommends from suggests, since it's now used for secure
verification of wget downloads, and so should sit at the same level as wget.

commit 2fafaa952d8ec6ef8e883177117c75645c88648e
Author: jnqnfe <jnqnfe@gmail.com>
Date:   Mon Jan 5 02:40:06 2015 +0000

    Promote gpgv dependency to recommends
    
    This should sit alongside wget, since its is used in secure verification of wget downloads now also (along with gpg).

diff --git a/debian/control b/debian/control
index e0e0ec0..ef373be 100644
--- a/debian/control
+++ b/debian/control
@@ -18,12 +18,12 @@ Recommends:
  apt-utils,
  cpio,
  gpg | gpg2,
+ gpgv,
  wget,
  live-boot-doc,
  live-config-doc,
  live-manual-html | live-manual,
 Suggests:
- gpgv,
  debian-keyring,
 Description: Live System Build Components
  The Live Systems project maintains the components to build Debian based Live