Support newly-created models when --model=*.xcdatamodeld
Support newly-created models when --model=*.xcdatamodeld

When models are freshly created, they only have one version and no 
.xccurrentversion file.  In this case, and only in this case, assume the 
only present model is the desired model.
VladimirGoncharov/mogenerator,skywinder/mogenerator,willowtreeapps/mattgenerator,kostiakoval/mogenerator,casademora/mogenerator,untitledstartup/mogenerator,iv-mexx/mogenerator,pronebird/mogenerator,pronebird/mogenerator,untitledstartup/mogenerator,Erin-Mounts/mogenerator,otaran/mogenerator,willowtreeapps/mattgenerator,ef-ctx/mogenerator,otaran/mogenerator,Erin-Mounts/mogenerator,seanm/mogenerator,hardikdevios/mogenerator,bewebste/mogenerator,fizker/mogenerator,seanm/mogenerator,iv-mexx/mogenerator,hardikdevios/mogenerator,adozenlines/mogenerator,bgulanowski/mogenerator,pronebird/mogenerator,bgulanowski/mogenerator,kostiakoval/mogenerator,otaran/mogenerator,bewebste/mogenerator,iv-mexx/mogenerator,skywinder/mogenerator,willowtreeapps/mattgenerator,rentzsch/mogenerator,VladimirGoncharov/mogenerator,adozenlines/mogenerator,casademora/mogenerator,VladimirGoncharov/mogenerator,anton-matosov/mogenerator,rentzsch/mogenerator,mjasa/mogenerator,seanm/mogenerator,mjasa/mogenerator,untitledstartup/mogenerator,bewebste/mogenerator,anton-matosov/mogenerator,fizker/mogenerator,bgulanowski/mogenerator,casademora/mogenerator,iv-mexx/mogenerator,adozenlines/mogenerator,hardikdevios/mogenerator,ef-ctx/mogenerator,skywinder/mogenerator,mjasa/mogenerator,anton-matosov/mogenerator,Erin-Mounts/mogenerator,bewebste/mogenerator,kostiakoval/mogenerator,fizker/mogenerator,ef-ctx/mogenerator,rentzsch/mogenerator