build: fix FTBFS on GCC 6.2

I'm not surprised that GCC 6 doesn't let me send an ostream ref to itself,
even inside an uninstantiated template specialization.  I am a little
surprised I was trying to, and 4.9 let me get away with it.

It's 2016.  auto_ptr is deprecated now.

Some things were including vector that don't any more.

https://github.com/Zygo/bees/issues/1

src/bees-context.cc

@@ -5,6 +5,7 @@
 
 #include <fstream>
 #include <iostream>
+#include <vector>
 
 using namespace crucible;
 using namespace std;