https as default url schema

currently the app fails to clone urls without schema

> should start with http:// or https://

default schema should be https

### other issues

#### repo name should be optional

> provide a value

if name is empty, use basename of url

#### wrong repo url in about

```diff
-https://github.com/andrewromanenco/git.android.git
+https://github.com/andrewromanenco/git.android
```



