Stopped wooden pipes from extracting from IEnergySources

It seems to be unnecessary. Extra utilities generators allow extraction directly, but they do not require it. And the previous code would waste energy if there wasn't enough room in the RFBattery when it was pulling from the generator, so this fixes that and removes unnecessary code.

![2014-10-20_15 51 12](https://cloud.githubusercontent.com/assets/246232/4709991/7f80fc02-58a4-11e4-8876-28b96d740f98.png)
![2014-10-20_15 51 18](https://cloud.githubusercontent.com/assets/246232/4709990/7f37890a-58a4-11e4-8383-42561b2b2620.png)
![2014-10-20_15 58 00](https://cloud.githubusercontent.com/assets/246232/4709989/7f0f87fc-58a4-11e4-899e-d8b65c340755.png)
![2014-10-20_16 03 08](https://cloud.githubusercontent.com/assets/246232/4710031/e65acf84-58a4-11e4-9333-b4cd02ee43bd.png)