prepare for 2.1.0 release
prepare for 2.1.0 release

samalbert/node-ldapauth,vsimonian/node-adauth,mrajagopal/node-ldapauth,trentm/node-ldapauth,topaxi/node-ldapauth-fork,appcelerator/node-ldapauth-fork,VadimIpatov/node-ldapauth,gratex/node-ldapauth,trentm/node-ldapauth