Update email address to nathan@corvino.com.
Specifiy OS X path, moving /usr/local/bin to the front; fix for Homebrew.

Aspirationally it would be nice to have a funciton that will take path
items and "move them to the front"; that is, drop them from the path if
they exist, and then prepend them to the path. This is a bigger problem,
so for now this fixes homebrew so that it overrides the system binaries.
Add an alias for "git status"-like display of a specified commit.

Use a cute alias-shell command trick to create an alias that will show
"git status"-like output for a specified commit. Relies on the caret to
specify first parent, so may be ... interesting with multi-parent
commits. Interestingly, is the exact alias in the stack overflow post
which showed the technique.
  http://stackoverflow.com/questions/3321492/git-alias-with-positional-parameters

Also shorten the alias for the same output between arbitrary commites.