added travis db configuration
added output buffer length detect
added debug option for phpunit
skiped session for fix bugs
skiped to test pgsqlCache when fail to connet to the pgsql
hided all session test code
updated test for enttiyExists validator
fixed record exists test error
added version detect for recordExists validator, ref DBAL-522
added strict search for array_search
fixed mysql testGetterAndSetter error
removed sqlite env, for it has been tested internal
added detect for fail to connect couchbase
added detect for fail to connect to monogodb server
try to fixed databse not found in pgsql databse env
added back session tests, hope very thing work proper~
added configuration for CircleCi
try --prefer-source for composer ?
try to fix session error
try to fix session error 2