Merge pull request #1 from tux21b/master

Update repo
Added code to output an error on CreateSession when the user provides an
empty array of hosts.

Added code to the test suite to make sure the issue does not appear
again in the future.
Removed unnecessary check for nil in cluster.go. Ran gofmt on files that
I ultered the code in.
Merge pull request #56 from phillipCouto/master

Return Error when user provides an empty array for hosts