Load private_config.fish at end of config.fish

Because some of its stuf depends on the environment being set up correctly
and it is the custom setup, so it should go last so-as to not be overwritten
fish cd command invokes after_cd even on `cd -`

Extracts after_cd hook into its own function which it invokes
at the appropriate time
Installer: Can turn off integration spec, useful when on planes, trains, and taxis
c: mild refactoring
Delineate which methods are private
Add note about different versions of ctags
Add authors
Add mate, an alias to the real textmate
tbe function -- test-env bundle exec