Tiny-ldap-manager

I'm glad to announce this new `v0.2` release, with the following new features and changes:
* Added support for deleting *entries* in *bulk*!.
* Added support for modifying LDAP *attributes* in *bulk*!.
* There's a new `bulk` action, which includes the following three LDAP operations:
* `--modify-attributes`
* `--add-entries`
* `--delete-entries`
* Note that the `add` action present in previous releases, is now moved with a new name, inside the `bulk` action!.
* Updated documentation in the README file!.

* Fixed wrong version in `_version.py`!.
* Add title for each column of `ls` output.
* Define a separate function for menu handling.
* Function `start_ldap_session()` was moved to the `tlmgr_core` module.

* Better code legibility in `ldap_action_modify()`
* Improved output alignment for `ls` function.
* Add license in `setup.py`.

Inaugural release!!. Features for this version:
* Available for installation via `pip`.
* Modify, add or remove LDAP attributes.
* Support for adding new LDAP entries by importing them from a CSV file!.
* Remove an LDAP entry given its DN!.
* Support for inspecting attributes of a given LDAP entry.