improve pipeline and add docs

Author: kbrsh

README.md

@@ -38,6 +38,29 @@ search("App");
 
 Combined with libraries like [Moon](http://moonjs.ga), you can create a simple real-time search.
 
+### Pipeline
+
+Wade uses a pipeline to preprocess data and search queries. By default, this pipeline will:
+
+* Make everything lowercase
+* Remove stop words
+
+A pipeline consists of different functions that process a string and modify it in some way, and return the string.
+
+You can easily modify the pipeline as it is available in `Wade.pipeline`, for example:
+
+```js
+// Don't preprocess at all
+Wade.pipeline = [];
+
+// Add custom processor to remove periods
+Wade.pipeline.push(function(str) {
+  return str.replace(/\./g, "");
+});
+```
+
+All functions will be executed in the order of the pipeline (0-n) and they will be used on each document in the data.
+
 ### License
 
 Licensed under the [MIT License](https://kingpixil.github.io/license) by [Kabir Shah](https://kabir.ml)

src/index.js

@@ -68,14 +68,14 @@ var removeStopWords = function(str) {
 var Wade = function(data) {
   var search = function(item) {
     var data = search.data;
-    var keywords = item.split(" ");
+    var keywords = Wade.process(item).split(" ");
     var keywordsLength = keywords.length;
     var lengths = new Array(keywordsLength);
     var tables = new Array(keywordsLength);
     var results = [];
 
     for(var i = 0; i < keywordsLength; i++) {
-      var keyword = Wade.process(keywords[i]);
+      var keyword = keywords[i];
       var length = keyword.length;
       lengths[i] = length;
       tables[i] = createTable(keyword, length);