bump files/brews/git.rb to the latest formula from homebrew
we're installing 1.9.1
install git with pcre
make puppet-lint happy
add -boxen1 version suffix
add back explicit boxen1 version to formula
don't bother with --with-pcre, just make its behaviour the default
Merge pull request #36 from boxen/git-1.9.1

Update git to 1.9.1