Switched back the compilation based upon pkgconfig tool on Linux
systems.

Changed the example.dbm file in order to show the fk column (not added
by rel.) modification.
Merge branch 'code-refactoring' of https://github.com/pgmodeler/pgmodeler into code-refactoring
Merge pull request #96 from babs/code-refactoring-trans-fr

Updated fr_FR translation
Fixed style configuration bug (issue #97)
Fixed build processo no Mac OSX
Adjusted compilation on Linux systems.
Some more adjustment to build on Linux systems.
Class ConfConexoesWidget refactored to ConnectionsConfigWidget
Class ConfGeralWidget refactored to GeneralConfigWidget
Class ConversaoCodificacaoWidget renamed to ConversionWidget.
Class ConversaoTipoWidget renamed to CastWidget. Pending comment
translation.

Correction on "Objects Of Model" widget when used in simplified view.
Class DestaqueSintaxe renamed to SyntaxHighlighter.
SyntaxHighlighter class refactoring checkpoint.
Improved PgModelerPlugin class.

Moved plugin load process from main form to the class
PluginsConfigWidget.
Update COMPILING.md, corrected Ubuntu special note.
Fix build process on Linux and Mac OSX
Merge branch 'code-refactoring' of https://github.com/pgmodeler/pgmodeler into code-refactoring
PgModelerPlugin structure change in order to run correctly on Windows
system.
Small fix on PgModelerPlugin class.
Introduced new feature: tables/view are now separated visually by
colored rectangles acting as its schemas. The rectangles can receive
some interaction like edit (righ-click to see all actions)