Squashed 'lib/birdbrain/' content from commit 67c37b3

git-subtree-dir: lib/birdbrain
git-subtree-split: 67c37b3b966192f38497141389c3ed96c2ca3f82
Merge commit '3c82daf8c74bea7e4bab0dcb8a250bb693138163' as 'lib/birdbrain'
First iteration - can process checklists with male, female, juv., imm. designations