Winner controller, winners by date, color or name.

Winner controller replaces a lot of what happens in retrieve did for
aggregating when and what had been won. Now this is more clearly defined
in winner.js.
Also leverage mongo's query more than sorting and aggregating data like
previous implementation where a lot happened in js.

api/controllers/winnerController.js

@@ -73,7 +73,7 @@ const byDate = (req, res) => {
     });
 };
 
-const groupedByDate = (req, res) => {
+const groupByDate = (req, res) => {
   const { sort, includeWines } = req.query;
 
   if (sort !== undefined && !sortOptions.includes(sort)) {
@@ -156,7 +156,7 @@ const byName = (req, res) => {
     });
 };
 
-const byColor = (req, res) => {
+const groupByColor = (req, res) => {
   const { includeWines } = req.query;
 
   if (includeWines !== undefined && !includeWinesOptions.includes(includeWines)) {
@@ -167,7 +167,7 @@ const byColor = (req, res) => {
   }
 
   return winnerRepository
-    .byColor(includeWines == "true")
+    .groupByColor(includeWines == "true")
     .then(colors =>
       res.send({
         colors: colors,
@@ -184,11 +184,40 @@ const byColor = (req, res) => {
     });
 };
 
+const orderByWins = (req, res) => {
+  const { includeWines } = req.query;
+
+  if (includeWines !== undefined && !includeWinesOptions.includes(includeWines)) {
+    return res.status(400).send({
+      message: `includeWines option must be: '${includeWinesOptions.join(", ")}'`,
+      success: false
+    });
+  }
+
+  return winnerRepository
+    .orderByWins(includeWines == "true")
+    .then(winners =>
+      res.send({
+        winners: winners,
+        success: true
+      })
+    )
+    .catch(error => {
+      const { statusCode, message } = error;
+
+      return res.status(statusCode || 500).send({
+        success: false,
+        message: message || "Unable to fetch winners by color."
+      });
+    });
+};
+
 module.exports = {
   all,
   byDate,
-  groupedByDate,
+  groupByDate,
   latest,
   byName,
-  byColor
+  groupByColor,
+  orderByWins
 };