CachedImage with resizeMode style cause warning

[wonday]

Hi kfiroo,

If I add resizeMode to CachedImage style, it will cause warning

<CachedImage style={{resizeMode:Image.resizeMode.stretch}} source={{uri:item.img}} />

Warning: Failed prop type: Invalid props.style key `resizeMode` supplied to `ActivityIndicator`.
Bad object: {
  "width": 360,
  "height": 592,
  "resizeMode": "stretch",
  "opacity": 0,
  "backgroundColor": "transparent",
  "alignItems": "center",
  "justifyContent": "center"
}
...
    in ActivityIndicator (created by CachedImage)
    in CachedImage (created by TopBannerItem)

Warning: Failed prop type: Invalid props.style key `resizeMode` supplied to `View`.
Bad object: {
  "alignItems": "center",
  "justifyContent": "center",
  "width": 360,
  "height": 592,
  "resizeMode": "stretch",
  "opacity": 0,
  "backgroundColor": "transparent"
}
...
    in View (created by ActivityIndicator)
    in ActivityIndicator (created by CachedImage)
    in CachedImage (created by TopBannerItem)

[wonday]

the same with #45 and #1

should not use resizeMode in style,
should use props resizeMode instead