Remove unnecessary allocation/deallocation from masterLock

* Add make_lock.
* Rename Application::LockType to Application::MutexType:
* Rename getMasterLock to getMasterMutex.
* Use getMasterMutex and make_lock.
* Remove unused code.

beast/utility/make_lock.h

@@ -0,0 +1,38 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of Beast: https://github.com/vinniefalco/Beast
+    Copyright 2015, Howard Hinnant <howard.hinnant@gmail.com>
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef BEAST_UTILITY_MAKE_LOCK_H_INCLUDED
+#define BEAST_UTILITY_MAKE_LOCK_H_INCLUDED
+
+#include <mutex>
+#include <utility>
+
+namespace beast {
+
+template <class Mutex, class ...Args>
+inline
+std::unique_lock<Mutex>
+make_lock(Mutex& mutex, Args&&... args)
+{
+    return std::unique_lock<Mutex>(mutex, std::forward<Args>(args)...);
+}
+
+} // beast
+
+#endif