Yum: add yum-cron*.conf files

(cherry picked from commit 148330ac79660e35b8726c7ec6fc8b6916c8a23e)
Shellvars: read /etc/firewalld/firewalld.conf

Fixes https://fedorahosted.org/augeas/ticket/363

(cherry picked from commit 63e322699272dd26fc9014c672ea5ce9e4fb21e8)
Grub: handle "foreground" option

Fixes RHBZ#1059383

(cherry picked from commit a370d9ccfbd0b6b6f927880014b29569c58b03c0)
Yum: permit spaces after equals sign in list options

Fixes GitHub issue #45

(cherry picked from commit deb73b5f284db09e3c63f2d7698ab140e2337a3d)
Shellvars: handle case statements with same-line ;; tokens

Fixes RHBZ#1033799

(cherry picked from commit a1b9831d14f22f81cf7dc840160c08cc14234ee9)

Conflicts:
	NEWS
	lenses/shellvars.aug