RVM gem compatibility fix
RVM gem compatibility fix

Running Hazel with the --rvm-gemset flag on a system with the rvm gem installed causes a RuntimeError.

```
RVM - Ruby integration was extracted to a separate gem, it should be installed by default with RVM, remove the `$LOAD_PATH.unshift` line and all should be fine again. (RuntimeError)
```
c7/hazel,c7/hazel