revert py3k change that breaks dict mixin
revert py3k change that breaks dict mixin

loisaidasam/gensim,akutuzov/gensim,zachmayer/gensim,Kreiswolke/gensim,dsquareindia/gensim,markroxor/gensim,macks22/gensim,mattilyra/gensim,tzoiker/gensim,Kreiswolke/gensim,manasRK/gensim,RaRe-Technologies/gensim,manasRK/gensim,gojomo/gensim,summanlp/gensim,robotcator/gensim,olavurmortensen/gensim,olavurmortensen/gensim,Kreiswolke/gensim,laic/gensim,bhargavvader/gensim,loisaidasam/gensim,dsquareindia/gensim,macks22/gensim,robotcator/gensim,davechallis/gensim,ziky90/gensim,RaRe-Technologies/gensim,bhargavvader/gensim,robotcator/gensim,davechallis/gensim,laic/gensim,manasRK/gensim,mattilyra/gensim,mattilyra/gensim,isohyt/gensim,quole/gensim,ziky90/gensim,tzoiker/gensim,isohyt/gensim,pombredanne/gensim,davechallis/gensim,zachmayer/gensim,laic/gensim,summanlp/gensim,macks22/gensim,isohyt/gensim,gojomo/gensim,akutuzov/gensim,loisaidasam/gensim,quole/gensim,RaRe-Technologies/gensim,jaksmid/gensim,RaRe-Technologies/gensim,jaksmid/gensim,pombredanne/gensim,akutuzov/gensim,piskvorky/gensim,dsquareindia/gensim,ELind77/gensim,pombredanne/gensim,quole/gensim,ziky90/gensim,piskvorky/gensim,jaksmid/gensim,gojomo/gensim,bhargavvader/gensim,markroxor/gensim,summanlp/gensim,piskvorky/gensim,olavurmortensen/gensim,gojomo/gensim,ELind77/gensim,ELind77/gensim,tzoiker/gensim,zachmayer/gensim,markroxor/gensim