Use the proper attribute name for max unique snapshots

The JSON key name for this attribute is `maxUniqueSnapshots` which has 
the underscored name of `max_unique_snapshots`.
Use non-default value to test `Repository#max_unique_snapshots`

By using the attribute’s default value of `0` we were masking the subtle 
bug fixed in 178c52fbca.
Add basic integration test converge for `Repository.find`
Enable running integration tests in Rakefile
Use the proper attribute name for checksum policy

The JSON key name for this attribute is `checksumPolicyType` which has
the underscored name of `checksum_policy_type`.
Use the proper attribute name for pom consistency checks

The JSON key name for this attribute is `suppressPomConsistencyChecks` 
which has the underscored name of `suppress_pom_consistency_checks`.
Merge pull request #33 from opscode/schisamo/repository-bug

Use the proper naming for various repository attributes