Fix some bugs of open quickly window

- do not scan packages
- do not crash when switching between neovim windows
- do not allow fullscreen
- close when losing focus

VimR/Base.lproj/OpenQuicklyWindow.xib

@@ -14,6 +14,7 @@
         <customObject id="-3" userLabel="Application" customClass="NSObject"/>
         <window title="Open Quickly" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" restorable="NO" oneShot="NO" releasedWhenClosed="NO" showsToolbarButton="NO" visibleAtLaunch="NO" frameAutosaveName="38.open-quickly-window.frame" animationBehavior="default" id="QvC-M9-y7g">
             <windowStyleMask key="styleMask" titled="YES" closable="YES" resizable="YES" texturedBackground="YES"/>
+            <windowCollectionBehavior key="collectionBehavior" fullScreenAuxiliary="YES"/>
             <windowPositionMask key="initialPositionMask" topStrut="YES"/>
             <rect key="contentRect" x="196" y="420" width="365" height="255"/>
             <rect key="screenRect" x="0.0" y="0.0" width="1440" height="877"/>

VimR/FileItem.swift

@@ -10,6 +10,7 @@ class FileItem : CustomStringConvertible {
   let url: NSURL
   let dir: Bool
   let hidden: Bool
+  let package: Bool
 
   /// When nil, then it has never been fnmatch'ed.
   weak var ignoreToken: Token?
@@ -31,6 +32,7 @@ class FileItem : CustomStringConvertible {
     self.url = url
     self.dir = url.dir
     self.hidden = url.hidden
+    self.package = url.package
   }
 
   func removeChild(withUrl url: NSURL) {

VimR/FileItemService.swift

@@ -154,7 +154,7 @@ class FileItemService {
 
           curItem.children
             .filter { item in
-              if item.hidden {
+              if item.hidden || item.package {
                 return false
               }
 

VimR/FoundationCommons.swift

@@ -54,6 +54,10 @@ extension NSURL {
   var hidden: Bool {
     return self.resourceValue(NSURLIsHiddenKey)
   }
+
+  var package: Bool {
+    return self.resourceValue(NSURLIsPackageKey)
+  }
 }
 
 extension Array {

VimR/OpenQuicklyWindowComponent.swift

@@ -308,8 +308,13 @@ extension OpenQuicklyWindowComponent {
     self.pattern = ""
     self.flatFileItems = []
     self.fileViewItems = []
+    self.fileView.reloadData()
     
     self.searchField.stringValue = ""
     self.countField.stringValue = "0 items"
   }
+
+  func windowDidResignKey(notification: NSNotification) {
+    self.window.performClose(self)
+  }
 }