LDAP support for change password.  This completes initial support
for the change password scenario.
 - Only tested on OpenLDAP, needs testing on other servers.
 - Also includes updated sample plugin with change password.
 - Adds a dependency on the BouncyCastle library.
 - Closes #26
Update version and SDK to 3.2.0.0
Ignore entries that are not GUIDs in the registry list of
credential providers.
  - Fixes #210
Merge pull request #223 from Oooska/radius-timeout

Radius Plugin Update