Merge tag '0.1.7' into develop

- Fix attachment using the wrong query builder;
- Fix connection issues on posts;
- Fix image fields when the image does not exist;
- Prevent exception for missing custom fields;
- Add `Flexible Content` field;
- Add tests for Flexible Content field;
- Fix issues when selecting a post or gallery as custom field;
- Fix custom fields with empty values;
- Add tests for empty custom fields;
- Avoid processing gallery with no items.

readme.md

@@ -101,8 +101,8 @@ First we should create the fields classes and the test cases. After we have to s
 | Date Time Picker  | ok        | [@jgrossi](http://github.com/jgrossi) | `Carbon\Carbon` |
 | Time Picker       | ok        | [@jgrossi](http://github.com/jgrossi) | `Carbon\Carbon` |
 | Color Picker      | ok        | [@jgrossi](http://github.com/jgrossi) | `string` |
-| Repeater          | partially | [@jgrossi](http://github.com/jgrossi) | `Collection` of fields |
-| Flexible Content  | missing   |                                       | |
+| Repeater          | ok        | [@jgrossi](http://github.com/jgrossi) | `Collection` of fields |
+| Flexible Content  | ok        | [@marcoboom](http://github.com/marcoboom) | `Collection` |
 
 # Contributing