Nebulizer

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* New class ``tools.ToolPanel`` and updates to existing
``tools.ToolPanelSection`` class.
* ``install_tool``: fix behaviour so that command does nothing if
a version is not specified and at least one version of the tool is
already installed.
* ``list_repositories`` and ``install_repositories``: new commands
to generate a list of installed tool repositories from a Galaxy
instance and then reinstall tool repositories from a list with
the same format
(`PR 19 <https://github.com/pjbriggs/nebulizer/pull/19>`_).
* ``install_tool``: fix incorrect reporting of target tool panel
section
(`PR 20 <https://github.com/pjbriggs/nebulizer/pull/20>`_)
* ``add_key`` and ``update_key``: fix automatic retrieval of API
key, which only worked previously if connecting user was an
admin account
(`PR 23 <https://github.com/pjbriggs/nebulizer/pull/23>`_)
* ``list_tool_panel``: shows tools in order they appear in Galaxy
when using ``--list-tools`` option.
* Deprecated utilities (``manage_users``, ``manage_tools`` and
``manage_libraries``) issue warnings when run.
* License updated to Academic Free License (AFL).
* Initial version of documentation also made available via
`ReadTheDocs <http://nebulizer.readthedocs.io>`_
(`PR 21 <https://github.com/pjbriggs/nebulizer/pull/21>`_)

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* Implemented new ``nebulizer`` utility which provides all previous
functionality via subcommands, plus commands for managing API keys
automatically (old ``manage_users``, ``manage_tools`` and
``manage_libraries`` utilities are still available for
backwards-compatibility but are deprecated).
* New general options:

- ``-q``/``--suppress-warnings``: prevent warning messages from
``nebulizer`` commands.

* Various fixes and improvements to underlying functionality:

- ``install_tools``: now checks if tool is already installed;
handles tool revisions that include the revision number; polls
Galaxy until tool is installed, or operation times out; exit
status reflects the success or failure of the installation.
- ``update_tool``: now works even if original tool isn't in a tool
panel section
- ``list_installed_tools``: now groups tools under correct repo
revision when using ``--list-tools`` option.

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* Add ``-u``/``--username`` and ``-P``/``--galaxy_password`` options
to all commands to allow interaction with Galaxy instance via API
using normal login credentials instead of API key.

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* Initial release of ``nebulizer`` utilities for administering
Galaxy instances via the command line.