Export the bucket types, too.
Export the bucket types, too.

Found by: Dongsheng Song <dongsheng.song{_AT_}gmail.com>

* build/gen_def.py:
  (_types): regex to match the bucket types
  (extract_funcs): renamed to ...
  (extract_exports): ... this. we also look for bucket types
  (__main__): track rename

zhupan/serf,pengdu/serf,alex1818/serf,yesoce/serf,stoneCC/serf,zhupan/serf,soufianeEL/serf,x-clone/serf,yesoce/serf,lazysoez/serf,SirJson/serf,yesoce/serf,alex1818/serf,pengdu/serf,zhengcq315/serf,zhengcq315/serf,x-clone/serf,soufianeEL/serf,alex1818/serf,yesoce/serf,KyleSanderson/serf,SirJson/serf,google-code-export/serf,KyleSanderson/serf,pengdu/serf,stoneCC/serf,x-clone/serf,soufianeEL/serf,lazysoez/serf,KyleSanderson/serf,lazysoez/serf,google-code-export/serf,SirJson/serf,zhengcq315/serf,SirJson/serf,zhupan/serf,zhupan/serf,lazysoez/serf,google-code-export/serf,pengdu/serf,soufianeEL/serf,google-code-export/serf,stoneCC/serf,alex1818/serf,KyleSanderson/serf,x-clone/serf,stoneCC/serf,zhengcq315/serf