Fixes and updates to the documentation. (#107)

* Readme: Format code in headline as code

* Readme: Document the fields of config.aggregations

* Readme: Fix sort value in example

In the readme, the `name_asc` in `.search` corresponds to the `configuration.sortings.name_asc` but in this example the key is different.

* Readme: Remove search example with `prefilter`

I cannot find `prefilter` in the code https://github.com/itemsapi/itemsjs/search?q=prefilter nor readme.

* Readme: Remove `isExactSearch` from configuration

This is an option for the search, not the configuration based on the readme https://github.com/itemsapi/itemsjs/blob/master/README.md#itemsjssearchoptions and code.

Author: tordans

README.md

@@ -166,7 +166,7 @@ Examples:
 
 ## API
 
-### var itemsjs = ItemsJS(data, [configuration])
+### `var itemsjs = ItemsJS(data, [configuration])`
 
 #### `data`
 
@@ -178,13 +178,22 @@ Responsible for defining global configuration. Look for full example here - [con
 
 - **`aggregations`** filters configuration i.e. for `tags`, `actors`, `colors`, etc. Responsible for generating facets.
 
+  Each filter can have it's own configuration. You can access those as `buckets` on the `search()` response.
+
+  - **`title`** Human readable filter name
+  - **`size`** Number of values provided for this filter (Default: `10`)
+  - **`sort`** Values sorted by `count` (Default) or `term` for the value name
+  - **`order`** `asc` | `desc`
+  - **`show_facet_stats`** `true` | `false` (Default) to retrieve the min, max, avg, sum rating values from the whole filtered dataset
+  - **`conjunction`** `true` (Default) stands for an _AND_ query (results have to fit all selected facet-values), `false` for an _OR_ query (results have to fit one of the selected facet-values)
+
 - **`sortings`** you can configure different sortings like `tags_asc`, `tags_desc` with options and later use it with one key.
 
 - **`searchableFields`** an array of searchable fields.
 
 - **`native_search_enabled`** if native full text search is enabled (true | false. It's enabled by default)
 
-### itemsjs.search(options)
+### `itemsjs.search(options)`
 
 #### `options`
 
@@ -206,7 +215,7 @@ Responsible for defining global configuration. Look for full example here - [con
 
 - **`is_all_filtered_items`** set to `true` if you want to return the whole filtered dataset. 
 
-### itemsjs.aggregation(options)
+### `itemsjs.aggregation(options)`
 
 It returns full list of filters for specific aggregation
 
@@ -216,9 +225,9 @@ It returns full list of filters for specific aggregation
 - **`per_page`** filters per page
 - **`page`** page number
 - **`query`** used for quering filters. It's not full text search
-- **`conjunction`** choose between AND, OR
+- **`conjunction`** `true` (Default) stands for an _AND_ query, `false` for an _OR_ query
 
-### itemsjs.similar(id, options)
+### `itemsjs.similar(id, options)`
 
 It returns similar items to item for given id
 
@@ -230,7 +239,7 @@ It returns similar items to item for given id
 - **`page`** page number
 
 
-### itemsjs.reindex(data)
+### `itemsjs.reindex(data)`
 
 It's used in case you need to reindex the whole data
 

docs/configuration.md

@@ -38,7 +38,6 @@ var itemsjs = require('itemsjs')(data, {
     }
   },
   searchableFields: ['name', 'tags'],
-  isExactSearch: true // Default false
 });
 ```
 
@@ -48,7 +47,7 @@ var itemsjs = require('itemsjs')(data, {
 // aggregation
 var movies = itemsjs.search({
   per_page: 1,
-  sort: 'name_asc',
+  sort: 'year_asc', // key from itemsjs configuration `sortings` object
   filters: {
     tags: ['1980s']
   }
@@ -78,14 +77,3 @@ var result = itemsjs.search({
   }
 });
 ```
-
-```js
-var result = itemsjs.search({
-  query: 'shoes',
-  prefilter: function(items) {
-    return items.filter(item => {
-      return item.price > 100;
-    });
-  }
-});
-```