Project-composer

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This release ensure any settings can be managed from Manifest and that commandlines
can override Manifest settings.

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**New Manifest system bring backward incompatible changes**

* Fixed Makefile install since colorlog is no longer an optional dependency;
* Update tox config to remove colorlog switch and to avoid installing documentation and
release stuff;
* Added Manifest model to store manifest datas;
* Added ``tomli`` dependency to add TOML format support for manifest;
* Requirements settings are now a part of manifest;
* Composer classes no longer accept options from args or kwargs, everything is driven
by Manifest. However commandlines are able to override manifest options from
arguments;
* RequirementsComposer have been removed since it has no meaning anymore, the
'requirements' commandline just directly use TextContentComposer;

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* Move CLI to click instead of argparse;
* Renamed option ``--appsdir`` to ``--repository``;
* Renamed option ``--base`` to ``--template``;
* Splitted CLI in subcommands, no longer need of ``--mode`` option;
* Improved some test to be safer with importation;
* Added ``purge`` command to definitively remove application module directory from
repository that are not enabled in manifest;

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* Fixed missing syspath argument usage from CLI;
* Fixed requirements dump from CLI;

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* Fixed collector for some issues to work correctly;

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* Fixed importer for some packages which add a Meta path finder in the old way (like for
deprecated ``imp``);
* Added a new test around importer;
* Removed some forgotten print usage from code;