Add lodash, rack-test

lodash.md

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+---
+title: Lodash
+---
+
+> This is an incomplete list.
+
+### Array
+
+```js
+_.chunk([ abcd ], 2)           //=> [ [ab], [cd] ]
+_.compact(list)
+
+_.difference([ abc ], [ bc ])  //=> [ a ]
+_.intersection()
+
+_.drop([ abcde ], 1)           //=> [ bcde ] (right)
+_.dropWhile
+
+_.dropRight
+_.dropRightWhile
+
+_.fill(Array(4), 'x')          //=> [ 'x', 'x', 'x', 'x' ]
+
+_.findIndex
+_.findLastIndex
+
+_.flatten
+_.flattenDeep
+
+_.indexOf(list, val)
+```

rack-test.md

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+---
+title: Rack-test
+---
+
+```rb
+get 'url'
+post 'url', 'name' => 'john'
+put
+patch
+delete
+options
+head
+
+authorize 'user', 'pass'
+env 'rack.session', csrf: 'token'
+header 'Content-Type', 'text/html'
+```
+
+See [rack/test.rb](https://github.com/brynary/rack-test/blob/master/lib/rack/test.rb).