Some changes

I've done some changes to your great textfield :)

- <b>backgroundColor</b>, change the textfield's background color
- <b>glowingColor</b>, change the textfield's glowing/shadow color
- <b>borderColor</b>, change the textfield's border color
- <b>alwaysGlowing</b>, if YES the textfield won't hide the glowing/shadow after resign first responder
- fixed a bug with glowing/shadow after textfield's frame changes