Fix lintian error and warnings

E: not-binnmuable-any-depends-all
P: copyright-refers-to-symlink-license
P: no-homepage-field

debian/control

@@ -31,12 +31,13 @@ Build-Depends: debhelper (>= 9),
                gnome-doc-utils (>= 0.8),
                gnome-pkg-tools (>= 0.10)
 Standards-Version: 3.9.2
+Homepage: https://github.com/linuxmint/muffin
 
 Package: muffin
 Architecture: any
 Depends: ${shlibs:Depends},
          ${misc:Depends},
-         muffin-common (= ${binary:Version}),
+         muffin-common (= ${source:Version}),
          libgnome2-common,
          zenity
 Provides: x-window-manager
@@ -61,7 +62,7 @@ Architecture: any
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${shlibs:Depends},
          ${misc:Depends},
-         muffin-common (= ${binary:Version})
+         muffin-common (= ${source:Version})
 Description: window manager library from the Muffin window manager
  Muffin is a small window manager, using GTK+ and Clutter to do
  everything.

debian/copyright

@@ -73,4 +73,4 @@ License: GPL-2+
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  .
  On Debian systems, the complete text of the GNU General
- Public License can be found in `/usr/share/common-licenses/GPL'.
+ Public License can be found in `/usr/share/common-licenses/GPL-2'.