Fixed BG sprite glitch. Minor fixes

BackgroundLayerFrame.py

@@ -0,0 +1,25 @@
+"""
+Background layer frame entity class
+"""
+
+
+import pygame
+
+
+class BackgroundLayerFrame(pygame.sprite.Sprite):
+    def __init__(self, image, mainGameClass, offset, speedMultiplier):
+        pygame.sprite.Sprite.__init__(self)
+
+        self.image = image
+        self.mainGameClass = mainGameClass
+        self.speedMultiplier = speedMultiplier
+
+        self.rect = self.image.get_rect()
+        self.rect.center = (mainGameClass.getScreenWidth()/2 + offset[0],
+                            mainGameClass.getScreenHeight()/2 + offset[1])
+
+
+    def update(self):
+        self.rect.x -= self.mainGameClass.getGameSpeed() * self.speedMultiplier
+        if self.rect.x < -self.rect.width:
+            self.rect.x += self.rect.width*2