Revert "agnoster theme shows error code instead of an "x""

This reverts commit f09af5717923cca4e5c538e14846ea4816295949.

It is far more aesthetically pleasing, and conveys the correct amount of information. The exact numeric status code is extremely rarely of use, and increases cognitive parsing burden on the user.
(cherry picked from commit 8f664edcaf55adcc540f0fe43d4205b66e4f9fb6)
add unbundled command
Fixes #1489

Revert "Fixed Mac OS X Terminal.app related issue with extra newlines being printed out sometimes"

This reverts commit 8f89d4d5a5d584bae288d8111d83a6489a1369dc.
Merge pull request #1517 from thisiskun/master

provide the unbundled commands
Merge pull request #1510 from agnoster/agnoster-classic

agnoster "classic"
add nave support to agnoster