Add LuCI support for HSO protocol (Option 3G card)

LuCI interface for HSO protocol to support Option 3G cards.
To use along with comgt + patch https://dev.openwrt.org/attachment/ticket/6995/comgt-hso_141012.patch
![image](https://cloud.githubusercontent.com/assets/7697801/5334920/da1bef5e-7e52-11e4-82f5-7f6bdf07285f.png)