Relocates third party class fro List_Table. Adds more columns to the attendee table.
Refactors README. Not Complete.
Changes version of the plugin to 0.9.0. Fixes problem with messages display logic (messages were overriden).  Closes #1 providing the option for the admin to deactivate sending email upon creating the attendee. Moves the messaging logic to RLM_RSVPlus_Util class. Refactors some other non afficientor wrong code.