Updated image docs

docs/objects/Image/selectFrame.md

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+## selectFrame
+The selectFrame method allows you to change the current frame of an image object. It takes a single parameter, the index of the frame you want to display.
+
+#### Parameters:
+
+1. `number` the frame index
+
+#### Returns:
+
+1. `object` The object in use
+
+#### Usage:
+
+* Creates a default image and loads a test.nfp file
+
+```lua
+local mainFrame = basalt.createFrame()
+local aImage = mainFrame:addImage():loadImage("test.bimg"):selectFrame(2)
+```