Better colors for text

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/base/variables.scss

 $hover: #FFFAF1;
-$gl-text-color: #54565b;
+$gl-text-color: #54565B;
+$gl-text-green: #4A2;
+$gl-text-red: #D12F19;
+$gl-text-orange: #D90;
 $gl-header-color: #4c4e54;
 $gl-link-color: #333c48;
 $md-text-color: #444;

app/assets/stylesheets/generic/common.scss

 /** COLORS **/
 .cgray { color: $gl-gray; }
 .clgray { color: #BBB }
-.cred { color: #D12F19 }
-.cgreen { color: #4a2 }
+.cred { color: $gl-text-red; }
+.cgreen { color: $gl-text-green; }
 .cdark { color: #444 }
 
 /** COMMON CLASSES **/

app/assets/stylesheets/pages/commit.scss

@@ -60,17 +60,17 @@
   }
   .new-file {
     a {
-      color: $gl-success;
+      color: $gl-text-green;
     }
   }
   .renamed-file {
     a {
-      color: $gl-warning;
+      color: $gl-text-orange;
     }
   }
   .deleted-file {
     a {
-      color: $gl-danger;
+      color: $gl-text-red;
     }
   }
   .edit-file{