Request, some fixes [ci skip]
Cache, backend file fix, enable CacheTest
Cache, backend apc, increment/decrement
Unit tests, enable FormsTest
Assets, update collection due to phalcon/zephir#417
Typeof boolean instead of bool, phalcon/zephir/issues/473
Assets fixes, enable AssetsTest
Merge pull request #2654 from mruz/2.0.0

2.0.0 improvements  v3