Added initial unit testing files for the pgsql driver.
Save point: WIP implementing db schema functionality.
Savepoint: WIP implementing columns
Savepoint, implementing fkeys.
Added last insert value to pgsql PDO
Savepoint WIP QueryBuilder!
Added table based sequence.
Removed unused columns.
Merge remote branch 'upstream/master' into pgsql-driver
Merge remote branch 'upstream/master' into pgsql-driver
Added foreign keys and cleanup internal pg types
Merge remote branch 'upstream/master' into pgsql-driver
Fixed several formatting issues.
Refactored == null to is_null == '' to empty(...)
Merge branch 'pgsql-driver' of github.com:gevik/yii2 into pgsql-driver
Refactored types to be compatible with 1.1
Fix new method name "getIsAjax" and fix web application class name in logger
Removed commented and unused pgsql datatype mappings.
Replaces spaces with tabs.
Update CompareValidator.php
Added db creation for travis CI This needs to be done in two seperate
command since postgres does not accept db creation in multiline statement.