Make many more utility classes/headers public. (#76)

Moving these headers from src to include enables other libraries to use the
functionality provided.

* tcpsockets
* atomic_static
* raw_istream
* timestamp
* SafeThread
* Base64
* LEB128
* ConcurrentQueue

The classes have been moved into the wpi namespace as they're generic.

src/support/raw_istream.cpp

@@ -0,0 +1,20 @@
+/*----------------------------------------------------------------------------*/
+/* 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.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "support/raw_istream.h"
+
+#include <cstring>
+
+using namespace wpi;
+
+bool raw_mem_istream::read(void* data, std::size_t len) {
+  if (len > m_left) return false;
+  std::memcpy(data, m_cur, len);
+  m_cur += len;
+  m_left -= len;
+  return true;
+}