Add sugestions

[tim-kilian]

Use Case

Since the output of the autosug request call is not a json, it might be usefull to have it in our api.

Example request

https://autosug.ebaystatic.com/autosug?kwd=example&sId=77
/api/suggestion?keyword=example
/api/suggestion?kwd=example

[tim-kilian]

We had to redesign the current structure for this one. There are now abstract classes EbayRequest, EbayParser for adding more different requests than the SearchRequest. There should also be an abstarction for EbayResult