setup.py: Support bdist_wheel
setup.py: Support bdist_wheel

Update issue 1674
Enabled creating wheels by importing setuptools in setup.py when bdist_wheel used.

After this change building wheels requires:

    pip install -U setuptools wheel
    python setup.py bdist_wheel

jorik041/robotframework,SivagnanamCiena/robotframework,jaloren/robotframework,nmrao/robotframework,Colorfulstan/robotframework,joongh/robotframework,synsun/robotframework,yonglehou/robotframework,edbrannin/robotframework,edbrannin/robotframework,synsun/robotframework,rwarren14/robotframework,xiaokeng/robotframework,ChrisHirsch/robotframework,SivagnanamCiena/robotframework,userzimmermann/robotframework,kyle1986/robortframe,fingeronthebutton/robotframework,kyle1986/robortframe,JackNokia/robotframework,ChrisHirsch/robotframework,yahman72/robotframework,un33k/robotframework,JackNokia/robotframework,eric-stanley/robotframework,yahman72/robotframework,kurtdawg24/robotframework,suvarnaraju/robotframework,jaloren/robotframework,JackNokia/robotframework,rwarren14/robotframework,un33k/robotframework,ashishdeshpande/robotframework,jorik041/robotframework,dkentw/robotframework,moto-timo/robotframework,ChrisHirsch/robotframework,kurtdawg24/robotframework,jaloren/robotframework,xiaokeng/robotframework,synsun/robotframework,stasiek/robotframework,fingeronthebutton/robotframework,snyderr/robotframework,robotframework/robotframework,robotframework/robotframework,yahman72/robotframework,alexandrul-ci/robotframework,stasiek/robotframework,wojciechtanski/robotframework,suvarnaraju/robotframework,suvarnaraju/robotframework,eric-stanley/robotframework,userzimmermann/robotframework,ashishdeshpande/robotframework,kyle1986/robortframe,kyle1986/robortframe,wojciechtanski/robotframework,yahman72/robotframework,userzimmermann/robotframework,snyderr/robotframework,stasiek/robotframework,alexandrul-ci/robotframework,yonglehou/robotframework,ashishdeshpande/robotframework,snyderr/robotframework,stasiek/robotframework,joongh/robotframework,dkentw/robotframework,joongh/robotframework,edbrannin/robotframework,suvarnaraju/robotframework,yahman72/robotframework,jorik041/robotframework,Colorfulstan/robotframework,un33k/robotframework,HelioGuilherme66/robotframework,alexandrul-ci/robotframework,nmrao/robotframework,eric-stanley/robotframework,alexandrul-ci/robotframework,un33k/robotframework,joongh/robotframework,Colorfulstan/robotframework,userzimmermann/robotframework,ChrisHirsch/robotframework,yonglehou/robotframework,un33k/robotframework,kurtdawg24/robotframework,moto-timo/robotframework,snyderr/robotframework,ashishdeshpande/robotframework,dkentw/robotframework,Colorfulstan/robotframework,eric-stanley/robotframework,suvarnaraju/robotframework,moto-timo/robotframework,snyderr/robotframework,jaloren/robotframework,kyle1986/robortframe,xiaokeng/robotframework,Colorfulstan/robotframework,fingeronthebutton/robotframework,dkentw/robotframework,nmrao/robotframework,nmrao/robotframework,fingeronthebutton/robotframework,kurtdawg24/robotframework,fingeronthebutton/robotframework,SivagnanamCiena/robotframework,rwarren14/robotframework,synsun/robotframework,dkentw/robotframework,JackNokia/robotframework,wojciechtanski/robotframework,SivagnanamCiena/robotframework,jaloren/robotframework,xiaokeng/robotframework,stasiek/robotframework,edbrannin/robotframework,alexandrul-ci/robotframework,HelioGuilherme66/robotframework,rwarren14/robotframework,wojciechtanski/robotframework,rwarren14/robotframework,xiaokeng/robotframework,nmrao/robotframework,HelioGuilherme66/robotframework,JackNokia/robotframework,ChrisHirsch/robotframework,yonglehou/robotframework,jorik041/robotframework,moto-timo/robotframework,jorik041/robotframework,yonglehou/robotframework,moto-timo/robotframework,joongh/robotframework,edbrannin/robotframework,ashishdeshpande/robotframework,synsun/robotframework,SivagnanamCiena/robotframework,wojciechtanski/robotframework,kurtdawg24/robotframework,robotframework/robotframework,userzimmermann/robotframework