add twitter, abstracts and slug to talk_abstracts
add twitter, abstracts and slug to talk_abstracts

barrachri/epcon,malemburg/epcon,matrixise/epcon,EuroPython/epcon,PythonSanSebastian/epcon,barrachri/epcon,malemburg/epcon,matrixise/epcon,matrixise/epcon,PythonSanSebastian/epcon,artcz/epcon,artcz/epcon,PythonSanSebastian/epcon,matrixise/epcon,barrachri/epcon,EuroPython/epcon,matrixise/epcon,malemburg/epcon,matrixise/epcon,artcz/epcon,artcz/epcon,barrachri/epcon,barrachri/epcon,artcz/epcon,PythonSanSebastian/epcon,EuroPython/epcon,malemburg/epcon,artcz/epcon,PythonSanSebastian/epcon,malemburg/epcon,barrachri/epcon,PythonSanSebastian/epcon,malemburg/epcon,EuroPython/epcon