Remove .ruby-version

Signed-off-by: Nikhil Gajwani <ngajwani@pivotallabs.com>
Update slop version

Signed-off-by: Nikhil Gajwani <ngajwani@pivotallabs.com>
Use most recent vagrant-centos image

Signed-off-by: Nikhil Gajwani <ngajwani@pivotallabs.com>
Increase vm memory to 2048 MB

Signed-off-by: Nikhil Gajwani <ngajwani@pivotallabs.com>