change pbkdf2.derive len parameter to use byte length instead of bit length to be consistent with other functions
update verifierVersion on account reset and password change
Upgrade to hapi v2.4.0
Merge pull request #577 from chilts/upgrade-to-hapi-v2-4-0

Upgrade to hapi v2.4.0
Merge pull request #576 from dannycoates/i575

update verifierVersion on account reset and password change
updated mysql module
default mysql connection limits to 10
added log.stat function
reworked mysql connection pooling

- added sql connection stat logging
- one retry on connection errors
- prevent pools from getting removed
Merge pull request #581 from dannycoates/mosql

Some MySQL connection improvements
Be explicit about the charset of each table
Merge pull request #583 from chilts/set-default-charset-on-mysql-tables

Be explicit about the charset of each table
Check and cache ts+nonce pairs, not just plain nonces.
Disable timestamp checking in authentication.

We're seeing too many problems due to clock skew between client and
server.  This turns off the timestamp checking and instead just logs
the skew for future analysis.
Merge pull request #584 from mozilla/rfk/nonce-cache-updates

Check and cache ts+nonce pairs, not just plain nonces.
Merge pull request #585 from mozilla/rfk/disable-hawk-timestamp

Disable timestamp checking in authentication
train-03