Phalcon\Db optimization
Fix #1679 add param local for Phalcon\Tag::linkTo
Fix #1679 Updated TagTest.php
Updated
Phalcon\Db\Adapter optimization
Phalcon\Db\Index optimization
Phalcon\Db\Profiler optimization
Phalcon\Db\Reference optimization
Phalcon\Db\Result\Pdo optimization
Updated CHANGELOG
Fix #1695
Updated CHANGELOG
MySQL dialect: INT(0) => INT
Test case for #1695
Updated CHANGELOG
Merge pull request #1692 from dreamsxin/1679

[NFR]Add new param local for Phalcon\Tag::linkTo
Merge pull request #1693 from sjinks/db-opt

Phalcon\Db Optimization
Merge pull request #1699 from sjinks/issue-1695

Fix handling of AUTOINCREMENT in addColumn()/modifyColumn()