Kytos-utils

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Added
=====
- Commands to enable/disable all installed NApps
(`kytos napps <enable/disable> all`).

Changed
=======
- Install and enable NApps based on Kytos instance. `kytos-utils` will request
the configuration loaded by kytos before managing NApps.

Removed
=======
- Support for NApp management whithout a Kytos running instance.

Fixed
=====
- A few bug fixes.

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Added
=====
- :code:`kytos users register` command can be used to register a new user in
the NApps server.
- Now under MIT license.

Changed
=======
- skel templates updated to match changes in logging and kytos.json.
- Improved tests and style check for developers, and added continuous
integration.

Deprecated
==========
- kytos.json 'author' attribute is being replaced by 'username' due to context,
and is deprecated. It will be removed in future releases.

Removed
=======
- kytos.json 'long_description' attribute is no longer necessary nor available.
The detailed description shall now be in README.rst.

Fixed
=====
- Now creates the NApps directory structure when it does not exist.
- Pypi package is fixed and working.
- Several bug fixes.

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Added
=====
- etc/skel files, with templates to create all the necessary NApp files when
executing :code:`kytos napps create`.
- Command line tool to manage the kytos NApps. A set of commands to help
managing NApps.

- May now use the command line to:
- Create new NApps.
- Install NApps created locally or from the NApps server.
- Enable/disable installed NApps.
- List installed / enabled NApps.
- Search for NApps in the NApps server.
- Upload NApps to the server.
- Help is available for command line tools. Appending :code:`--help` to the
end of a command displays useful information about it.

Changed
=======
- Setup script now installs all the requirements during the setup process.
There is no need to worry about them beforehand.
- Updated to Python 3.6.
- Several bug fixes.
- Separate CLI code from NApps code: refactored code to make clear what is
related to the command line tools and what is related to the kytos NApps.
- Clean and descriptive log messages.

Security
========
- Authentication for NApps upload process - there is need for an account in
the `NApps server <https://napps.kytos.io>`__ to upload any NApp.