** Added LocalWorkspaceReader into MavenClient that can be used to ease
the plugin development by using the plugin directly from the workspace
instead of uploading it first into maven repository
** Added project for mailchimp plugin
** Added pom.xml for MailChimp plugin
** Added plugin descriptor for MailChimp plugin
** Added initial draft of MailChimp plugin
** Added descriptor for ScheuledPlugins
** Added methods for listing scheduled plugings and scheduled tasks into
PluginManager
** Added scheuler that executes scheduled plugin tasks
** Refactored MailChimp plugin synchronization json page into a
scheduled task
** if user changes email, old is removed from mailchimp
** Fixed a typo in ScheduledTaskInterval class name
** Simplified ScheduledTaskInterval enum names
** Added more logging into MailChimpSynchronizationTask
** Added null check into PluginManager getScheduledTasks method
** Renamed unsubscribeEmails -> removeEmails list in MailChimpSyncUtils