Removing ruby script\rails server

This is an offshoot of request #67. I believe (but I may not be in the majority) that for the sake of clarity that we remove the option to change OS which changes the line to start the rails server. 

![screen shot 2013-06-13 at 11 21 17 am](https://f.cloud.github.com/assets/2406167/649470/5750fe7e-d445-11e2-9342-2a9a094f8c9a.png)

We should try not to propagate the use of ruby script/[ARGS] since rails [ARGS] was purposely created to unify all rails commands into the same file. Also, if we are just trying to be brief, it seems like a  lot code just to change that one line, and the links are not necessarily obvious (hence #67 OP's confusion). Also, this is not a feature seen in the other language versions, all of which use rails server or rails s. If this is merged, we can go about adding Ctrl + break to the other languages as well.

So in this pull request I've removed the OS switching links, rails server is the only command given, and I added using ctrl + break for Windows users in both lines that instruct the user to quit the server.

![screen shot 2013-06-13 at 11 29 38 am](https://f.cloud.github.com/assets/2406167/649508/74fb3cb8-d446-11e2-9c28-78476a883431.png)