Switch to version 2.0.0~beta4
Update of zip creation for kmz observers

* Created Archiver class
* Removed 7zip use
* Added zip creation using libArchive
* Added tests

(closes OpenFLUID/openfluid#197)
Fix of characters parsing in simulator signature with boost grammar

* Improved characters list parsed
* Improved differences processing between string and var names
* Added status processing in grammar
* Cleaned code
Add method to check islands presence into a PolygonGraph layer

* Added method
* Added related tests
Fix of win32 compatibility

* Added missing DLLEXPORT in classes declarations
* Added custom FindGEOS module
* Replaced Output browser of OpenFLUID-Builder by calling Windows
Explorer (on win32 only)
* Fixed various problems