fix the "no attribute persist" error when ThunderbirNightly is cleaned - bug 1025887
Merge pull request #120 from parkouss/1025887

fix the "no attribute persist" error when ThunderbirNightly is cleand - bug 1025887
bug 996810 and bug 997322 - other repos can't be used
Merge pull request #102 from sinemetu1/bug996810-fx-team-repo-cant-be-used

bug 996810 and bug 997322 - other repos can't be used
make mozregression use exceptions
fix KeyboardInterrupt handling when downloading