Allow use of pbr 0.7
Allow use of pbr 0.7

Notably, Ubuntu 14.04 comes with pbr 0.7.

tdhopper/lda-1,ariddell/lda,ww880412/lda,hothHowler/lda,tdhopper/lda-1,tdhopper/lda-1,ww880412/lda,hothHowler/lda,ww880412/lda,ariddell/lda,ariddell/lda,hothHowler/lda