Added pgmodeler-cli to pgmodeler-intl.pro file.
Removed unused exceptions.
Removed an invalid reference to widget. (issue #201)
Major change on main window style.

Removed "Save widget positions" from configurations.

Main windows does not support fullscreen mode anymore.
Finished main window restyling.
Merge branch 'ui-changes' into pgsql9x-support
Added a base implementation for model validation.
Minor fix on MacOSX building: pgModeler is no more packed into a app
bundle.

Class ExportHelper renamed to ModelExportHelper
Build scripts tuning.
Changed qmake variable QMAKE_LFLAGS_SHLIB to QMAKE_LFLAGS

Created ValidationInfo and ModelValidationHelper classes to support
model validation
Fixed building process on Windows system
Minor changes on .pro files.
Fixed building process on MacOSX.
Added an option to list available connections on pgmodeler-cli.
Added JSON datatype (issue #203)

ModelValidationWidget coding checkpoint.
Added a title bar to OperationListWidget and ModelValidationWidget and a
close button to ModelValidationWidget

Minor fixes on ui-style.conf
Added a class to handle PostgreSQL Extensions.

Minor fix on modelobjectswidget.ui
Added schema files for Extension.
Added an icon to Extension.
Added an experimental support for Extension objects. (issue #204)