Merge pull request #113 from washort/master

ctrl-t transpose key.
Generalize rol and ror
Proposed change to name of carrier ~led, Laozi
Warn about unset URBIT_HOME
Quick 64-bit fixes.
Merge branch 'master' of github.com:urbit/urbit
Various fixes etc.
Merge branch 'master' of github.com:urbit/urbit
Various fixes and improvements.
Better checkin.
WIP AES
added ~rislus-dopsym as ~wep
AES block en/decryption working
Comments
Merge remote-tracking branch 'urbit/master'
More comments
Fix to match doc.
Merge branch 'master' of github.com:urbit/urbit
GF(bex n) in zuse
Test compilation routines.