Unify paging params

* Remove built in paging params for paginated operations
* Add a ``--starting-token`` and a ``--max-items`` option
Add log message about modifying paging params
Merge branch 'unify-paging' into develop

Closes #193.

* unify-paging:
  Add log message about modifying paging params
  Unify paging params
Adding a --priv-launch-key parameter to get-password-data which allows the encrypted password to be decrypted using the supplied SSH private key file.
Resolving merge conflict.