Remove Ciql::Client which is no longer used directly

* This may be restored in the future when/if Ciql uses
  cql-rb directly again.
Remove Gemfile.lock from gem

* A rubygem usually should not check in a Gemfile.lock
Remove references to cql-rb libs
Fix UUID handling by using Ciql::Sanitize.sanitize

* The CassandraCQL::Statement.sanitize has a bug in how it handles
  UUID values. It insists on quoting them as strings which is
  invalid in Cassandra.

  This bug is the result of splitting the casting and quoting into
  separate methods. It should be done at the same time since
  different types have different quoting requirements.

  The Ciql::Sanitize.sanitize method handles quoting properly.