Test persistent storage under Travis

.travis.yml

@@ -39,7 +39,7 @@ before_install:
       sudo apt-get update;
       sudo apt-get install -y clang-$CLANG llvm-$CLANG;
       export CC=clang-$CLANG;
-      export CONFIGURE_ARGS="--enable-developer-warnings --enable-debugging-symbols --disable-stack-protector ${SAN_FLAGS}";
+      export CONFIGURE_ARGS="--enable-developer-warnings --enable-debugging-symbols --disable-stack-protector --with-persistent-storage ${SAN_FLAGS}";
       export ASAN_OPTIONS=abort_on_error=1,detect_odr_violation=1,detect_leaks=1,detect_stack_use_after_return=1,detect_invalid_pointer_pairs=1,handle_segv=0,handle_sigbus=0,use_sigaltstack=0;
       export LSAN_OPTIONS=abort_on_error=1,use_sigaltstack=0,suppressions=$(pwd)/tools/lsan.suppr;
       export TSAN_OPTIONS=abort_on_error=1,halt_on_error=1,use_sigaltstack=0,suppressions=$(pwd)/tools/tsan.suppr;