Rename base64 to Base64.

Change-Id: I0dea9f77ca898ab1a278a0b0163418f96f823725

src/Base64.h

@@ -0,0 +1,23 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2015. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#ifndef NT_BASE64_H_
+#define NT_BASE64_H_
+
+#include <cstddef>
+#include <string>
+
+#include "llvm/StringRef.h"
+
+namespace ntimpl {
+
+std::size_t Base64Decode(llvm::StringRef encoded, std::string* plain);
+void Base64Encode(llvm::StringRef plain, std::string* encoded);
+
+}  // namespace ntimpl
+
+#endif  // NT_BASE64_H_