Font shorthand parsing fixed

See ExCSS pull request #62: https://github.com/TylerBrinks/ExCSS/pull/62

Source/External/ExCSS/Model/Values/TermList.cs

@@ -119,5 +119,13 @@ namespace ExCSS
             Comma,
             Space
         }
+
+        internal void SetLastTerm(Term term)
+        {
+            if (Length == 0)
+                AddTerm(term);
+            else
+                _items[Length - 1] = term;
+        }
     }
 }

Source/External/ExCSS/Parser.cs

@@ -131,18 +131,18 @@ namespace ExCSS
 
         private bool AddTerm(Term value)
         {
+            var added = true;
+
             if (_isFraction)
             {
                 if (_terms.Length > 0)
                 {
-                    value = new PrimitiveTerm(UnitType.Unknown, _terms[0] + "/" + value);
-                    _terms = new TermList();
+                    value = new PrimitiveTerm(UnitType.Unknown, _terms[_terms.Length - 1] + "/" + value);
                 }
-
+                _terms.SetLastTerm(value);
                 _isFraction = false;
             }
-
-            if (_functionBuffers.Count > 0)
+            else if (_functionBuffers.Count > 0)
             {
                 _functionBuffers.Peek().TermList.Add(value);
             }
@@ -156,10 +156,10 @@ namespace ExCSS
             }
             else
             {
-                return false;
+                added = false;
             }
 
-            return true;
+            return added;
         }
 
         private void FinalizeProperty()