Update conkyrc

- Use defined interface names (en0 / wl0 for ethernet and wireless)
- Show wireless information if wireless is connected
- Only show ethernet information if en0 is connected
- Change cpu so that it isn't a bar anymore - it takes up too much space
  on a 12" display. Instead, use a percentage & turn red when over 75%.
- Hide the date in NY and LA time zones - I can infer these dates from
  todays date & their time.
- Remove Upload / Download text from the network speeds to save space.
- Add battery 1
- Make battery 0 go red when under 25%, make battery 1 go red when under
  10 percent.