Bug Fixes:

* Fix the heat exchanger passing a null fluid when auto-outputting an empty tank. 

Changes:

* Added oil generation debug logging:
    * Enable some logging by adding "-Dbuildcraft.energy.oilgen.debug=log" to your launch arguments.
    * Enable all logging (very spammy) by adding "-Dbuildcraft.energy.oilgen.debug=true" instead of the above to your launch arguments.
* Updated Chinese translation. (SampsonnZ)