Select setuptools in setup.py if available.
Select setuptools in setup.py if available.

Fixes #173.

--HG--
extra : convert_revision : svn%3A3ed01bd8-26fb-0310-9e4c-ca1a4053419f/networkx/trunk%40832

harlowja/networkx,chrisnatali/networkx,kernc/networkx,yashu-seth/networkx,RMKD/networkx,ionanrozenfeld/networkx,goulu/networkx,SanketDG/networkx,sharifulgeo/networkx,ltiao/networkx,dmoliveira/networkx,bzero/networkx,jakevdp/networkx,jakevdp/networkx,Sixshaman/networkx,blublud/networkx,farhaanbukhsh/networkx,OrkoHunter/networkx,wasade/networkx,cmtm/networkx,dhimmel/networkx,ghdk/networkx,ghdk/networkx,jni/networkx,ionanrozenfeld/networkx,nathania/networkx,blublud/networkx,harlowja/networkx,tmilicic/networkx,andnovar/networkx,dmoliveira/networkx,jtorrents/networkx,sharifulgeo/networkx,kernc/networkx,jakevdp/networkx,aureooms/networkx,dmoliveira/networkx,aureooms/networkx,kai5263499/networkx,nathania/networkx,sharifulgeo/networkx,blublud/networkx,debsankha/networkx,dhimmel/networkx,jtorrents/networkx,jcurbelo/networkx,beni55/networkx,farhaanbukhsh/networkx,chrisnatali/networkx,bzero/networkx,farhaanbukhsh/networkx,kai5263499/networkx,dhimmel/networkx,JamesClough/networkx,chrisnatali/networkx,michaelpacer/networkx,jni/networkx,bzero/networkx,kai5263499/networkx,jni/networkx,debsankha/networkx,nathania/networkx,debsankha/networkx,ghdk/networkx,harlowja/networkx,RMKD/networkx,kernc/networkx,ionanrozenfeld/networkx,jfinkels/networkx,RMKD/networkx,aureooms/networkx,NvanAdrichem/networkx