2.3.15:

* Added optional starting_folder_uri parameter, to use,
 for instance, when opening an examples folder.
 convenience method.
* g++ 4.01 build fixes.
* Translations: Added Ukranian (Maxim Dziumanenko),
 Greek (Kostas Papadimas), Chinese (Taiwan) (Chao-Hsiung Liao),
 Chinese (China) (Funda Wang), British English (Christopher Orr),
 Spanish (Francisco Javier F. Serrador),
 Brazilian Portugese (Raphael Higino),
 Canadian English (Adam Weinberger), Kinyarwanda (Steve Murphy),
 Norwegian (Marcel Telka)