Initial work on user/source/grant/revoke management
More work on security
Some initial work on GRANT/REVOKE
Fix  a bug with wildcards
Implement REVOKE and fix some bugs
Support for certificate authentication
Implement initial security context renewal based on a global epoch
Add pbkdf2 as a dep
Initial pass at generating a pbkdf2 pass
Fix hmac algorithm
Move password auth into its own module
Add ability to register to a proplist
Support dynamically registered auth backends
Updates to pw_auth and riak_core_security modules
Remove unneeded case statement
Logging the plaintext password would be bad
Remove extra newline
WIP rebase on top of cluster metadata
More WIP cluster metadata work
Finish porting to cluster metadata