Make testem.js available on development.

Read test options from config file (Testem always tries to do it).

If we don't pass it then it will try to read from the following list
https://github.com/airportyh/testem/blob/master/lib/config.js#L41,
finding testem.js and breaking the app.

Fix indentation.
Merge pull request #432 from abuiles/testem.js

Add dummy file.