Implement CI infrustructure

[PavelAndrianov]

As the project is developed, it will be useful to have some CI. The main stages may be:

• Build stage. Checks, that all external tools can be downloaded and build. Also, checks the deployment script of CV.
• Checks stage. Run some code style and code check tools for python.
• Unit tests stage. Run simple tests to check configurations and basic functionallity of different components.
• Integration tests. Run complicated tests.