* was already done, but inconsistently
* this style follows homebrew Formula
* covers user-facing messages, test titles, comments
* some related minor orthography is included, such
as the consistent spelling of our project name as
"homebrew-cask"
* grammar nits
global replace of:
'phinze/homebrew-cask' -> 'caskroom/homebrew-cask'
'phinze/cask' -> 'caskroom/cask'
'phinze/homebrew-testcasks' -> 'caskroom/homebrew-testcasks'
and various other specific places that needed updates
<3 the homebrew-cask community!
