[Repair]Fix bug #2270
Merge pull request #2273 from dreamsxin/repair

[Restore]Fix bug #2270
Fix #2250 updated Phalcon\Db\Dialect::select
Fix #2250 updated Phalcon\Db\Dialect\Oracle::select
Merge pull request #2274 from dreamsxin/2251

Fix #2251
Merge pull request #2275 from dreamsxin/2250

Fix #2250 Updated Phalcon\Db\Dialect::select
Fix #2278 add Phalcon\Logger\Multiple::CRITICAL
Merge pull request #2281 from dreamsxin/2278

Fix #2278 add Phalcon\Logger\Multiple::CRITICAL
Add class Phalcon\Session\Adapter\Memcache
Updated
Merge pull request #136 from dreamsxin/2231_memcache

2231 memcache