Fixes StackExchange/dapper-dot-net#152

Allows use of IDictionary<string, object> as parameter objects.
I'm assuming that the && was a mistake, and that this logic should
handle both of the types equally well.
Also allows .NET 3.5 to use the IDictionary case.

Dapper NET40/SqlMapper.cs

@@ -2048,9 +2048,12 @@ private static CacheInfo GetCacheInfo(Identity identity, object exampleParameter
                     {
                         info.ParamReader = (cmd, obj) => { ((IDynamicParameters)obj).AddParameters(cmd, identity); };
                     }
-#if !CSHARP30
-                    // special-case dictionary && `dynamic`
-                    else if (exampleParameters is IEnumerable<KeyValuePair<string, object>> && exampleParameters is System.Dynamic.IDynamicMetaObjectProvider)
+#if CSHARP30
+                    else if (exampleParameters is IEnumerable<KeyValuePair<string, object>>)
+#else
+                    // special-case dictionary and `dynamic`
+                    else if (exampleParameters is IEnumerable<KeyValuePair<string, object>> || exampleParameters is System.Dynamic.IDynamicMetaObjectProvider)
+#endif
                     {
                         info.ParamReader = (cmd, obj) =>
                         {
@@ -2058,7 +2061,6 @@ private static CacheInfo GetCacheInfo(Identity identity, object exampleParameter
                             mapped.AddParameters(cmd, identity);
                         };
                     }
-#endif
                     else
                     {
                         var literals = GetLiteralTokens(identity.sql);