Replace .rvmrc with .ruby-version and .ruby-gemset

The current paradigm for version switching in ruby is to use a .ruby-version and .ruby-gemset file in place of he .rvmrc which just contains a use. This allows for a more generic use that won't cause warnings on the users console.

An appropriate .ruby-version would be:
```
1.9.3
```

And an appropriate .ruby-gemset would be:
```
newtech
```