Adding bitset and complex, both untested

This makes us "feature complete (tm)" as far as things that look worth serializing in the standard library

just need the unit tests for these then we can profile size and speed vs boost

binary_archive/complex.hpp

@@ -0,0 +1,28 @@
+#ifndef CEREAL_BINARY_ARCHIVE_COMPLEX_HPP_
+#define CEREAL_BINARY_ARCHIVE_COMPLEX_HPP_
+
+#include <cereal/binary_archive/binary_archive.hpp>
+#include <complex>
+
+namespace cereal
+{
+  //! Serializing (save) for std::complex to binary
+  template <class T> inline
+  void save( BinaryOutputArchive & ar, std::complex<T> const & comp )
+  {
+    ar & comp.real();
+    ar & comp.imag();
+  }
+
+  //! Serializing (load) for std::complex to binary
+  template <class T> inline
+  void load( BinaryInputArchive & ar, std::complex<T> & bits )
+  {
+    T real, imag;
+    ar & real;
+    ar & imag;
+    bits = {real, imag};
+  }
+} // namespace cereal
+
+#endif // CEREAL_BINARY_ARCHIVE_COMPLEX_HPP_