Add patch to with small fix to gtsam/slam/SmartFactorsBase.h

gtsam/distinfo

 SHA1 (gtsam-3.1.0.tgz) = faba7b25d6dc4f03c0d2b5486cae6294cde49301
 RMD160 (gtsam-3.1.0.tgz) = ae8c978e16966d66c332bb0183bd71ef840244ac
 Size (gtsam-3.1.0.tgz) = 18228078 bytes
+SHA1 (patch-aa) = 1390af9ce452d0585d13ebcab7f13ecf7fc8b4fc

gtsam/patches/patch-aa

+--- gtsam/slam/SmartFactorBase.h	2014-06-01 21:22:39.000000000 +0200
++++ gtsam/slam/SmartFactorBase.h	2014-10-03 15:30:49.756247706 +0200
+@@ -572,7 +572,7 @@
+ 
+     FastMap<Key,size_t> KeySlotMap;
+     for (size_t slot=0; slot < allKeys.size(); slot++)
+-      KeySlotMap.insert(std::make_pair<Key,size_t>(allKeys[slot],slot));
++      KeySlotMap.insert(std::make_pair(allKeys[slot],slot));
+ 
+     // a single point is observed in numKeys cameras
+     size_t numKeys = this->keys_.size(); // cameras observing current point