Set default for `minimum_master_nodes` when using Chef search for nodes
Set default for `minimum_master_nodes` when using Chef search for nodes

Closes #141

paulczar/cookbook-elasticsearch,spuder/cookbook-elasticsearch,gilt/cookbook-elasticsearch,zzugg/cookbook-elasticsearch,spuder/cookbook-elasticsearch,gilt/cookbook-elasticsearch,vacay/vcy-elasticsearch,gilt/cookbook-elasticsearch,vacay/vcy-elasticsearch,nbudin/cookbook-elasticsearch,zzugg/cookbook-elasticsearch,vacay/vcy-elasticsearch,zzugg/cookbook-elasticsearch,GemHQ/cookbook-elasticsearch,gouketsu/cookbook-elasticsearch,michaeld/elasticsearch-cookbook,nbudin/cookbook-elasticsearch,gouketsu/cookbook-elasticsearch,spuder/cookbook-elasticsearch,nbudin/cookbook-elasticsearch,gouketsu/cookbook-elasticsearch