Using https as required by the API

[Yahoo Contacts and Profile APIs move to HTTPS](http://yahoodevelopers.tumblr.com/post/75633763287/yahoo-contacts-and-profile-apis-move-to-https)
```Yahoo Mail connections are now encrypted with HTTPS by default. To support this move, we have also enabled HTTPS access to Yahoo Contacts and Profile APIs.```
see also [this thread](https://developer.yahoo.com/forum/OAuth-General-Discussion-YDN-SDKs/http-social-yahooapis-com-Will-be-right-back/1395509802423-89faffa2-1503-486d-bc29-6505719bd774)