Added partials

- Very good attempt at project 1 especially after missing 2 days; 
- I have made some revisions to your code below - I would not advise mixing up html and haml, choose either one of the other and stick to it throughout the project; 
- I have put the your sale and item forms in partials that you can render from both the edit and new view so that you dont have to repeat both of the forms twice;
- All the crud functionality is working well,  and I really like the search function!;