Impl storage mongo driver and config

init.sh

@@ -0,0 +1,23 @@
+#! /bin/bash
+
+port=57017
+
+if ! curl -sS localhost:$port > /dev/null; then
+   prefix=/tmp/whodunit.db
+   mkdir -p $prefix/data
+   mongod \
+      --dbpath $prefix/data \
+      --logpath $prefix/log \
+      --pidfilepath $prefix/pid \
+      --port $port \
+      --fork
+fi
+
+mshell() {
+   mongo \
+      --quiet \
+      --port $port \
+      --eval "$*"
+}
+
+export DBURI=${DB_URI:-"mongodb://localhost:$port"}