Upgrade to C++-14:

* Remove cxx14 compatibility layer from ripple
  * Update travis to clang 3.6 and drop gcc 4.8
  * Remove unneeded beast CXX14 defines
  * Do not run clang build with gdb with travis
  * Update circle ci to clang 3.6 & gcc-5
  * Don't run rippled in gdb, clang builds crash gdb
  * Staticly link libstdc++, boost, ssl, & protobuf
  * Support builds on ubuntu 15.10

src/ripple/server/impl/Peer.h

@@ -40,7 +40,7 @@
 #include <list>
 #include <memory>
 #include <mutex>
-#include <beast/cxx14/type_traits.h> // <type_traits>
+#include <type_traits>
 
 namespace ripple {
 namespace HTTP {

src/ripple/server/impl/SSLPeer.h

@@ -22,7 +22,7 @@
 
 #include <ripple/server/impl/Peer.h>
 #include <beast/asio/ssl_bundle.h>
-#include <beast/cxx14/memory.h> // <memory>
+#include <memory>
 
 namespace ripple {
 namespace HTTP {

src/ripple/server/impl/ServerHandlerImp.cpp

@@ -35,7 +35,6 @@
 #include <ripple/rpc/impl/Tuning.h>
 #include <beast/crypto/base64.h>
 #include <ripple/rpc/RPCHandler.h>
-#include <beast/cxx14/algorithm.h> // <algorithm>
 #include <beast/http/rfc2616.h>
 #include <boost/algorithm/string.hpp>
 #include <boost/type_traits.hpp>