Tests, Travis-CI

[populov]

Autotests must include:

1. Parse yaml with this working code.
2. Filter results by tag. Check, that well-known, unlikely to change result is present (ex. VueJS).
3. Search by free text.
4. Any tests, that make sense to guarantee, that application works.

Set up build with Travis-CI, and run tests there.
Thus, if anyone commits invalid YAML file, build should fail.