update to 0.4.0

[michaelkryukov]

• Moved tools subpackage to main package
• Moved contents of plugindata to plugin
• Fixed error with kutana_error

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have added tests to cover my changes.
• [x] I have read the CONTRIBUTING document.
• [x] All new and existing tests passed.

[coveralls]

Pull Request Test Coverage Report for Build 126

• 22 of 23 (95.65%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 93.687%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kutana/controllers/vk/vkcontroller.py	1	2	50.0%
<!--	Total:	22	23	95.65%	-->

Totals
Change from base Build 121:	0.07%
Covered Lines:	653
Relevant Lines:	697

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💛 - Coveralls