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

bin/ci/ubuntu/build-and-test.sh

@@ -25,10 +25,15 @@ if [[ $TARGET == "coverage" ]]; then
   # We pass along -p to keep path segments so as to avoid collisions
   codecov --gcov-args=-p --gcov-source-match='^src/(ripple|beast)'
 else
-  # Run unittests (under gdb)
-  cat $__dirname/unittests.gdb | gdb \
-      --return-child-result \
-      --args $RIPPLED_PATH --unittest
+  if [[ $CC == "clang" ]]; then
+    # gdb segfaults with a clang build
+    $RIPPLED_PATH --unittest
+  else
+    # Run unittests (under gdb)
+    cat $__dirname/unittests.gdb | gdb \
+        --return-child-result \
+        --args $RIPPLED_PATH --unittest
+  fi
 fi
 
 # Run NPM tests

bin/ci/ubuntu/install-dependencies.sh

@@ -9,11 +9,20 @@ do
   test -x $( type -p ${g}-$GCC_VER )
   ln -sv $(type -p ${g}-$GCC_VER) $HOME/bin/${g}
 done
+for c in clang clang++
+do
+    test -x $( type -p ${c}-$CLANG_VER )
+    ln -sv $(type -p ${c}-$CLANG_VER) $HOME/bin/${c}
+done
 export PATH=$PWD/bin:$PATH
 
 # What versions are we ACTUALLY running?
-g++ -v
-clang -v
+if [ -x $HOME/bin/g++]; then
+    $HOME/bin/g++ -v
+fi
+if [ -x $HOME/bin/clang]; then
+    $HOME/bin/clang -v
+fi
 # Avoid `spurious errors` caused by ~/.npm permission issues
 # Does it already exist? Who owns? What permissions?
 ls -lah ~/.npm || mkdir ~/.npm