#32 added undefined variable and set max to 1000
Merge pull request #4 from deanearlbartolabac/32syncperformance

#32 added undefined variable and set max to 1000
32 sync on main site only

This allows plugin activation and cron execution to be done on the main
site only.
see https://github.com/Link7/WPT/issues/32
Merge pull request #5 from deanearlbartolabac/32domainsyncmainsiteonly

#32 sync on main site only
added Link7 to plugin name