Never send blur events to specs window

This makes sure that specs that rely on focus behavior don't end up failing because our focus is on an entirely different window.

Atom/src/AtomController.h

@@ -12,6 +12,7 @@ class ClientHandler;
   NSView *_devToolsView;
   NSString *_bootstrapScript;
   NSString *_pathToOpen;
+  bool _runningSpecs;
   
   CefRefPtr<CefV8Context> _atomContext;
   CefRefPtr<ClientHandler> _clientHandler;

Atom/src/AtomController.mm

@@ -37,6 +37,7 @@
 }
 
 - (id)initSpecsWithAtomContext:(CefRefPtr<CefV8Context>)atomContext {
+  _runningSpecs = true;
   return [self initWithBootstrapScript:@"spec-bootstrap" atomContext:atomContext];
 }
 
@@ -130,7 +131,7 @@
 
 #pragma mark NSWindowDelegate
 - (void)windowDidResignMain:(NSNotification *)notification {
-  if (_clientHandler && _clientHandler->GetBrowser()) {
+  if (_clientHandler && _clientHandler->GetBrowser() && !_runningSpecs) {
     _clientHandler->GetBrowser()->SendFocusEvent(false);
   }
 }