Log errors in preload script instead of rethrowing

At some point, unhandled errors in preload scripts stopped being logged
to console, meaning that preload scripts were very difficult to debug.
Instead, print the error to console (which is what we wanted to have
happen anyways)

atom/renderer/lib/init.coffee

@@ -103,5 +103,8 @@ if preloadScript
   try
     require preloadScript
   catch error
-    throw error unless error.code is 'MODULE_NOT_FOUND'
-    console.error "Unable to load preload script #{preloadScript}"
+    if error.code is 'MODULE_NOT_FOUND'
+      console.error "Unable to load preload script #{preloadScript}"
+    else
+      console.error(error)
+      console.error(error.stack)