Fix check_dependencies.sh so it works on recent ubuntu linux as well as
mac.

Among many fixes, the psql postgres user test now users 'sudo', which
was not used in any of the tests before. I believe this is necessary for
ubuntu.
add 256-bit entropy paranoia to generateKeys

re: #125
don't send hmacKey to server when saving account
restore specific values to account object from server
add recordIndex to container payload to mitigate reordering attacks
implement deleteMessage transaction chunk type
implement message destruction
demonstrate message deletion in chat2 example
change message schema to reflect move away from RSA
quick commit for review. first half of message encryption changes
fall back to encrypting with bob's public key because SJCL already does a kem. run HMAC verification on message decryption
test merge origin/check_dependencies-compat

ndencies-compat

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Merge branch 'dz-generatekeys-paranoia' of https://github.com/dhain/crypton into big-merge-test
dz-hmackey-storage
removed the now not-expected hmacKey form the serialization step
merge dz-account-secrets
merge dz-container-ordering
merge srp-auth
fixed account and core tests with correct properties
ectos delete_message PR