Added boxen upgrade instructions
Added more detailed update process
Moved Upgrading instructions to FAQ
fixed spelling error
Update README.md

Other boxem fixed.
Merge pull request #587 from nbmorgan/master

Added boxen upgrade instructions
Upgrade puppet-git to 2.3.1

Closes #598
gitignore vendor/cache
Massive fixup of commit history

rebase hides a multitude of sins
keep brew packages up to date
get rid of imagemagick, use graphicsmagick
manage .puppet-lintrc
updating various Boxen components
sudoers privs for toggleBoxen
rolling back to puppet-ruby 7.3.0
quash some warnings
install plenv from homebrew
plenv needs perl-build
install libssh2
install Fluid