when opening a repository with the gitx command also activate GitX (pieter#4)

The commit 8c15c66 (Open repositories through AppleEvents.)
changed the way the gitx command line tool opens repositories
from NSWorkspace to AppleScript.

It seems that using NSWorkspace is like actually »opening« the
document/repository while the AppleScript implementation is like
the AppleScript »open« command.

This reestablishes the old behaviour by sending an activate command
before opening the document.

Author: ssp

Classes/gitx.m

@@ -117,6 +117,7 @@ void handleDiffWithArguments(NSURL *repositoryURL, NSArray *arguments)
 void handleOpenRepository(NSURL *repositoryURL, NSArray *arguments)
 {
     GitXApplication *gitXApp = [SBApplication applicationWithBundleIdentifier:kGitXBundleIdentifier];
+	[gitXApp activate];
     [gitXApp open:repositoryURL withOptions:arguments];
     return;
 }