poppinss / adonis-fold / 90

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travis-ci

feat(ioc): add with method (#12)

This method allows us to run code only when the namespace exists and is available.

Instead of
```js
try {
  const View = this.app.use('Adonis/Src/View')
  const Can = require('../src/ViewBindings/Can')
  const Cannot = require('../src/ViewBindings/Cannot')

  View.tag(new Can())
  View.tag(new Cannot())
} catch (error) {
  // Ignore error when end-user is not using views
}
```

Write
```js
this.app.with('Adonis/Src/View', (View) => {
  const Can = require('../src/ViewBindings/Can')
  const Cannot = require('../src/ViewBindings/Cannot')

  View.tag(new Can())
  View.tag(new Cannot()) 
})
```

**Method signature:**
```ts
with (namespaces: string | string[], next: Function): void
```

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