Added documentation about Regex replica selector and the property pegasus.selector.replica.regex.rank.[value] 
Added documentation about Regex replica selector and the property pegasus.selector.replica.regex.rank.[value] 


pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus