Fix unpack error on _executeQueryCommand
Check ReadPreference object on ReplSet.canRead
Do not return false when the connection buffer is still empty
Added parallelCollectionScan to collection, passed through bulk size, confirmed sort properly passed in
Merge remote-tracking branch 'ek/fix-eqc' into 1.4
Fixed formating
Merge remote-tracking branch 'ek/fix-replset-canread' into 1.4
Merge remote-tracking branch 'ek/fix-validate-buffer-limit' into 1.4