Change xxx.xxx to example.com in .env.example

xxx.xxx is a valid domain name and resolves to a porn directory. While this probably isn't an Apple sized problem ( http://goo.gl/aQaq4 ), it's probably better to use an actual example domain anyways.
Merge pull request #1 from infogulch/patch-1

Change xxx.xxx to example.com in .env.example
Adds ruby-version file
Ignore bin folder
Lower minimum payment to $1