Merge pull request #35 from pmjones/develop-2

convert ExtensionProxy to FunctionProxy
Merge pull request #36 from pmjones/develop-2

Finish IMAP and LDAP adapters
Merge pull request #37 from pmjones/develop-2

add ldap/imap readme and tests
markup fix
typo fix
Merge pull request #38 from harikt/typo

typo fix
Update todo with the things done and removed
Merge pull request #39 from harikt/todo

Update todo with the things done and removed
$data is always present
no longer destroy sessions
verifier only needed for some adapters