Unit tests, enable db tests due to #2616
Unit tests, setup databases
Fixing forms tests
Initial implementation of Phalcon\Registry
Fixing Mvc\Router tests, enabling more tests
Merge pull request #2653 from mruz/2.0.0_db_tests

[2.0.0] Unit tests, enable db tests due to #2616
Request, some fixes [ci skip]
Cache, backend file fix, enable CacheTest
Cache, backend apc, increment/decrement
Unit tests, enable FormsTest