SERVER-16586 Fix mongoperf crash with MMF and syncDelay

Closes #886

Signed-off-by: Matt Kangas <matt.kangas@mongodb.com>
SERVER-16603 Fix rocks build

Signed-off-by: Matt Kangas <matt.kangas@mongodb.com>
SERVER-16604 Stop special-casing oplog in capped collections

Signed-off-by: Matt Kangas <matt.kangas@mongodb.com>
Merge remote-tracking branch 'upstream/master'