Link created as local user

Fixes #50
~/.tmux.rb owned by user, not root

Fixes #51
Adding Pacifist app
Merge branch 'add-pacifist' into develop
Fixed homebrew outdated package detection

 - Make grep match more strict so it won't match packages which happen to contain the package name as a substring
Merge branch 'fix-brew-outdated-package-detection' into develop
Adding package_id for gpgtools so it only runs the first time
Merge branch 'add-mac-gpgtools' into develop