compass: use bundlerApp, cleanup

pkgs/development/tools/compass/Gemfile.lock

@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    chunky_png (1.3.4)
+    chunky_png (1.3.11)
     compass (1.0.3)
       chunky_png (~> 1.2)
       compass-core (~> 1.0.2)
@@ -14,15 +14,18 @@ GEM
       sass (>= 3.3.0, < 3.5)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    ffi (1.9.8)
-    multi_json (1.11.0)
-    rb-fsevent (0.9.4)
-    rb-inotify (0.9.5)
-      ffi (>= 0.5.0)
-    sass (3.4.13)
+    ffi (1.10.0)
+    multi_json (1.13.1)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
+    sass (3.4.25)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  compass
+  compass!
+
+BUNDLED WITH
+   1.17.2