Feature/method from

Please review the method ```from``` support.
Appears that is pretty simple fix to express-load itself. Most of commit is example.
It would cover #7 (and it kinda second approach to same issue)

BTW found that at the c9.io you have to chdir(or use .from) to load properly examples. So dont get curious about 
```js
load
   .from(__dirname) // <-- this one is needed when run on c9.io as the cwd there is points to root of repo
   .load('config')
   .into(app);
```