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 extra code just to change that one line, which is not necessarily noticeable (hence #67 OP's confusion). 

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)