Squashed feature branch:

* Added CUDA support
 * Performance improvements
 * API improvements
 * Added "depth" parameter to GEMM
 * Android cross-compilation

include/isaac/tools/to_string.hpp

@@ -0,0 +1,23 @@
+#ifndef ISAAC_TOOLS_TO_STRING_HPP
+#define ISAAC_TOOLS_TO_STRING_HPP
+
+#include <string>
+#include <sstream>
+
+namespace isaac
+{
+namespace tools
+{
+
+template<class T>
+inline std::string to_string ( T const t )
+{
+  std::stringstream ss;
+  ss << t;
+  return ss.str();
+}
+
+}
+}
+
+#endif