App is now topmost while launching. Closes #178.

Heartbeat/Base.lproj/Main.storyboard

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.Storyboard.XIB" version="3.0" toolsVersion="7706" systemVersion="14E46" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" initialViewController="Eli-nr-tnn">
+<document type="com.apple.InterfaceBuilder3.Cocoa.Storyboard.XIB" version="3.0" toolsVersion="7706" systemVersion="14F27" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" initialViewController="Eli-nr-tnn">
     <dependencies>
         <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="7706"/>
         <plugIn identifier="com.apple.imagekit.ibplugin" version="7706"/>

Heartbeat/MainWindow.swift

@@ -25,5 +25,14 @@ class MainWindow: NSWindow
         
         // Fade in the window (via extension: NSWindow+ADBWindowEffects)
         self.fadeInWithDuration(0.75)
+        
+        // Make sure that the window appears above all others…
+        self.level = Int(CGWindowLevelForKey(CGWindowLevelKey(kCGMaximumWindowLevelKey)))
+        
+        // …Until it has faded in. After which, defer to regular level.
+        delay(0.75)
+        {
+            self.level = Int(CGWindowLevelForKey(CGWindowLevelKey(kCGNormalWindowLevelKey)))
+        }
     }
 }

Heartbeat/PreloaderWindow.swift

@@ -37,6 +37,9 @@ class PreloaderWindow: NSWindow
         opaque = false
         backgroundColor = NSColor.clearColor()
         styleMask = NSBorderlessWindowMask
+        
+        // Make sure that the window appears above all others.
+        self.level = Int(CGWindowLevelForKey(CGWindowLevelKey(kCGMaximumWindowLevelKey)))
     }