Bug: Branch name parsing breaks on slashes

[evannoronha]

Problem

 COMINOR  enoronha 12:31:25 (unbreak-saving-wikis-in-cloud/on-prem) ~/Code
▶  cimpler build
Adding build of on-prem to the queue ... OK
 COMINOR  enoronha 12:31:28 (unbreak-saving-wikis-in-cloud/on-prem) ~/Code
▶  cimpler build -b "unbreak-saving-wikis-in-cloud/on-prem"
Adding build of unbreak-saving-wikis-in-cloud/on-prem to the queue ... OK

Do This

Ensure parsing branch names works when the branch name includes a /