Merge pull request #98 from AntonShevchuk/master

Added esc() function
Merge pull request #99 from AntonShevchuk/master

Added requirement to PHP extensions
Merge pull request #100 from AntonShevchuk/master

Added Select source for Grid
Merge pull request #101 from AntonShevchuk/master

Updated Db\Db::query() method, now it will return rowCount()
Merge pull request #102 from AntonShevchuk/master

Updated autoloader
Merge pull request #103 from AntonShevchuk/master

Updated CRUD for remove hardcoded JS funciton name
Added handler for error with max upload size