Add dplyr to common R packages

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>
Merge branch 'master' of github.com:michaelbarton/dotfiles
Merge branch 'master' of github.com:michaelbarton/dotfiles
Merge branch 'master' of github.com:michaelbarton/dotfiles
Merge branch 'master' of github.com:michaelbarton/dotfiles
Fix zsh git tab completion

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>
Update dictionary

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>