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.

include/support/timestamp.h

@@ -0,0 +1,28 @@
+/*----------------------------------------------------------------------------*/
+/* 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 WPIUTIL_SUPPORT_TIMESTAMP_H_
+#define WPIUTIL_SUPPORT_TIMESTAMP_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+unsigned long long WPI_Now(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#ifdef __cplusplus
+namespace wpi {
+
+unsigned long long Now();
+
+}  // namespace wpi
+#endif
+
+#endif  // WPIUTIL_SUPPORT_TIMESTAMP_H_