Show HEAD in the sidebar if it's detached

Fixes rowanj#235, rowanj#394, rowanj#300

Author: tiennou

Classes/git/PBGitRepository.m

@@ -333,6 +333,11 @@ - (void) reloadRefs
 
 	NSError* error = nil;
 	NSArray* allRefs = [self.gtRepo referenceNamesWithError:&error];
+
+	if ([self.gtRepo isHEADDetached]) {
+		// Add HEAD when we're detached
+		allRefs = [allRefs arrayByAddingObject:@"HEAD"];
+	}
 
 	// load all named refs
 	NSMutableOrderedSet *oldBranches = [self.branchesSet mutableCopy];