Revert "added uid to principal in signed key"

This reverts commit 91bfb7951a3e565d0c65109cef5fd3ee460b6308.

Conflicts:
	routes/sign.js
	test/run/signer_tests.js
Revert "Unhexlify the email address when embedding it in a certificate."

This reverts commit 2d2ce24c94dc092dd6f3f2964ffa0ce3c16c536e.

Conflicts:
	routes/sign.js