added rudimentary admin pages, started testing validation code

routes/middleware/load_exercise.js

@@ -0,0 +1,17 @@
+var exercise = require('../../data/models/exercise');
+
+function loadexercise(req, res, next) {
+  exercise.findOne({_id: req.params._id})
+    .exec(function(err, exercise) {
+      if (err) {
+        return next(err);
+      }
+      if (! exercise) {
+        return res.send('Not found', 404);
+      }
+      req.exercise = exercise;
+      next();
+    });
+}
+
+module.exports = loadexercise;