+ tests

https://github.com/piwik/piwik/issues/8850

Since autoloading is used now, do not manually include fixture files during tests. Fixes case when one plugin has issue in fixture class making it impossible to run tests (since the tests:run will just fail).

UI tests: New API for Glossary + link to glossary on Help page https://github.com/piwik/piwik/issues/6773

Fixes https://github.com/piwik/piwik-log-analytics/issues/96, do not fail bulk tracking request if individual request has an incorrect request parameter.

Update tests/travis submodule for: use --force to avoid random failure in travis when running git checkout.

Added INI setting to configure maximum number of id actions to store in one cache entry + integration tests

Caching id actions in general cache - can be enabled via INI setting enable_segments_subquery_cache setting (disabled by default)

Move date parsing logic from ArchiveInvalidator to CoreAdminHome/API.php so the service class only accepts well formed input.