showing the mail-in-a-box version might fail if git isn't actually installed
showing the mail-in-a-box version might fail if git isn't actually installed

The user might acquire the sources via some means other than a git clone. On Vagrant, the files come in via Vagrant. So test for git before running `git describe`.

jjz/mailinabox,ianberinger/mailinabox,mail-in-a-box/mailinabox,nstanke/mailinabox,pichak/mailinabox,Neopallium/mailinabox,brocktice/mailinabox,ianberinger/mailinabox,mail-in-a-box/mailinabox,PortableTech/mailinabox,d5ve/mailinabox,brocktice/mailinabox,PortableTech/mailinabox,b-deng/mailinabox,b-deng/mailinabox,mboersma/mailinabox,Neopallium/mailinabox,jprice/mailinabox,m4rcs/mailinabox,ianberinger/mailinabox,pierreozoux/mailinabox,hnk/mailinabox,d5ve/mailinabox,jprice/mailinabox,jprice/mailinabox,Toilal/mailinabox,jjz/mailinabox,pierreozoux/mailinabox,mboersma/mailinabox,mail-in-a-box/mailinabox,Toilal/mailinabox,hnk/mailinabox,choltha/mailinabox,mboersma/mailinabox,brocktice/mailinabox,jjz/mailinabox,pierreozoux/mailinabox,brocktice/mailinabox,b-deng/mailinabox,mboersma/mailinabox,jmedding/mailinabox,PortableTech/mailinabox,nstanke/mailinabox,mail-in-a-box/mailinabox,hnk/mailinabox,Toilal/mailinabox,pichak/mailinabox,b-deng/mailinabox,jmedding/mailinabox,Toilal/mailinabox,m4rcs/mailinabox,d5ve/mailinabox,choltha/mailinabox,ianberinger/mailinabox,m4rcs/mailinabox,nstanke/mailinabox,choltha/mailinabox,jmedding/mailinabox,nstanke/mailinabox,m4rcs/mailinabox,Neopallium/mailinabox,hnk/mailinabox,ianberinger/mailinabox,jjz/mailinabox,pierreozoux/mailinabox,Neopallium/mailinabox,jjz/mailinabox,jprice/mailinabox,PortableTech/mailinabox,PortableTech/mailinabox,pichak/mailinabox,b-deng/mailinabox,pierreozoux/mailinabox,d5ve/mailinabox,brocktice/mailinabox,choltha/mailinabox,pichak/mailinabox,nstanke/mailinabox,d5ve/mailinabox,jmedding/mailinabox,choltha/mailinabox,Neopallium/mailinabox,jprice/mailinabox,mboersma/mailinabox,jmedding/mailinabox,m4rcs/mailinabox