set cosSim calculate to true only if there are more than 2 nodes being calculated;
popCron 1 min, checkDir 15 mins, rss feed update 30 mins
Merge pull request #47 from gregorylull/refactor

set cosSim calculate to true only if there are more than 2 nodes
Merge pull request #48 from nextup/refactor

Only set cosSimCalculating to true if there are more than 2 doc nodes