Changed clean to clear - according to STL convention

cppcms/application.h

@@ -272,7 +272,7 @@ namespace cppcms {
 		///
 		/// This function is used for cleanup unused stuff, it should not throw
 		///
-		virtual void clean();
+		virtual void clear();
 
 	private:
 

cppcms/url_dispatcher.h

@@ -188,7 +188,7 @@ namespace cppcms {
 			}
 			~page_guard()
 			{
-				object_->clean();
+				object_->clear();
 			}
 		private:
 			C *object_;

src/application.cpp

@@ -169,7 +169,7 @@ void application::init()
 {
 }
 
-void application::clean()
+void application::clear()
 {
 }