use optional_crypto aes in ECB mode everywhere
use all 32 bits of the circuit id
Fix 0-hop for gumby
Unconditional ping, removed RQ
Removed PingRequestCache and references
Fixed typo
Small changes
Asserts
Fixes
More exception stacktraces
Clearer error message
Removed irrelevant crypto code
Changes
Pop RequestCache always if a message was received
Unit test
Merge pull request #617 from Devristo/devel

[testing] Simplified ping scheme