create a new role called Views Reader

1. Let's create a new role called Views Reader
2. Having Views Reader on a bucket means that the user should be able to query all map reduce views on the bucket and look at the view defn. Changing view defn should not be allowed with Views Reader

Was:
As per PRD: 

1. A user with only bucketReader privileges should be able to read and query the view for that bucket
2. A user with only bucketReadWriter privileges should be able to read and query the view for that bucket