{My,Pg}SqlDriver: do not connect to database in constructor

[closes nextras#72]

fixed escapeInt not returning string in some dbal adapters

fixed escapeInt not returning string in some dbal adapters

BaseDriver: fixed error when there were comments at the end of file

readme: removed hhvm status badge

Merge pull request nextras#49 from matej21/doctrine_clear_cache

Doctrine StructureDiffGenerator: clear metadata cache

MigrationsExtension: simplify configuration

order resolver: fixed tests for exception contents

Added database name to lock name in MySQL

BaseDriver: fixed loadFile() incorrent failure on empty files