CLIProxy: pass on the directory in which the gitx command is run

PBCLIProxy.m

@@ -56,6 +56,7 @@ - (BOOL)openRepository:(NSURL*)repositoryPath arguments: (NSArray*) args error:(
 		[document.windowController showCommitView:self];
 	else {
 		PBGitRevSpecifier* rev = [[PBGitRevSpecifier alloc] initWithParameters:arguments];
+		rev.workingDirectory = repositoryPath;
 		document.currentBranch = [document addBranch: rev];
 		[document.windowController showHistoryView:self];
 	}