** Added common logging interface
** Added CDI event to login
** Added Mongodb log provider
** Added listener for login events
** Updated core-plugins descriptor
** Moved mongodb logging into external plugin
** Added .gitignore
** Added message which displays last login information
** Added proper error handling
** Added human-readable description to authentication interface
Merge branch 'devel' into FTR-40_CALEVT

Conflicts:
	muikku-core/src/main/java/fi/muikku/auth/AbstractAuthenticationStrategy.java
	muikku-data/muikku-plugin-libraries.properties
** Added Google-Calendar-Plugin to parent